diff --git a/poetry.lock b/poetry.lock
index 1ed5d4c..3109ea5 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,36 +1,34 @@
 [[package]]
-category = "dev"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 name = "appdirs"
+version = "1.4.3"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.4.3"
 
 [[package]]
-category = "dev"
-description = "Disable App Nap on OS X 10.9"
-marker = "sys_platform == \"darwin\""
 name = "appnope"
+version = "0.1.0"
+description = "Disable App Nap on OS X 10.9"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.1.0"
 
 [[package]]
-category = "dev"
-description = "Atomic file writes."
-marker = "sys_platform == \"win32\""
 name = "atomicwrites"
+version = "1.3.0"
+description = "Atomic file writes."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.3.0"
 
 [[package]]
-category = "dev"
-description = "Classes Without Boilerplate"
 name = "attrs"
+version = "19.3.0"
+description = "Classes Without Boilerplate"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "19.3.0"
 
 [package.extras]
 azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
@@ -39,81 +37,80 @@ docs = ["sphinx", "zope.interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 
 [[package]]
-category = "dev"
-description = "Specifications for callback functions passed in to an API"
 name = "backcall"
+version = "0.1.0"
+description = "Specifications for callback functions passed in to an API"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.1.0"
 
 [[package]]
-category = "dev"
-description = "Cross-platform colored terminal text."
-marker = "sys_platform == \"win32\" or platform_system == \"Windows\""
 name = "colorama"
+version = "0.4.3"
+description = "Cross-platform colored terminal text."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "0.4.3"
 
 [[package]]
-category = "dev"
-description = "Code coverage measurement for Python"
 name = "coverage"
+version = "4.4.2"
+description = "Code coverage measurement for Python"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "4.4.2"
 
 [[package]]
-category = "dev"
-description = "Decorators for Humans"
 name = "decorator"
+version = "4.4.2"
+description = "Decorators for Humans"
+category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*"
-version = "4.4.2"
 
 [[package]]
-category = "dev"
-description = "Distribution utilities"
 name = "distlib"
+version = "0.3.0"
+description = "Distribution utilities"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.3.0"
 
 [[package]]
-category = "dev"
-description = "Discover and load entry points from installed packages."
 name = "entrypoints"
+version = "0.3"
+description = "Discover and load entry points from installed packages."
+category = "dev"
 optional = false
 python-versions = ">=2.7"
-version = "0.3"
 
 [[package]]
-category = "dev"
-description = "colorful TAB completion for Python prompt"
 name = "fancycompleter"
+version = "0.9.1"
+description = "colorful TAB completion for Python prompt"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.9.1"
 
 [package.dependencies]
-pyreadline = "*"
+pyreadline = {version = "*", markers = "platform_system == \"Windows\""}
 pyrepl = ">=0.8.2"
 
 [[package]]
-category = "dev"
-description = "A platform independent file lock."
 name = "filelock"
+version = "3.0.12"
+description = "A platform independent file lock."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "3.0.12"
 
 [[package]]
-category = "dev"
-description = "the modular source code checker: pep8, pyflakes and co"
 name = "flake8"
+version = "3.7.9"
+description = "the modular source code checker: pep8, pyflakes and co"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "3.7.9"
 
 [package.dependencies]
 entrypoints = ">=0.3.0,<0.4.0"
@@ -122,31 +119,28 @@ pycodestyle = ">=2.5.0,<2.6.0"
 pyflakes = ">=2.1.0,<2.2.0"
 
 [[package]]
-category = "dev"
-description = "flake8 plugin that integrates isort ."
 name = "flake8-isort"
+version = "2.9.1"
+description = "flake8 plugin that integrates isort ."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "2.9.1"
 
 [package.dependencies]
 flake8 = ">=3.2.1"
+isort = {version = ">=4.3.5", extras = ["pyproject"]}
 testfixtures = "*"
 
-[package.dependencies.isort]
-extras = ["pyproject"]
-version = ">=4.3.5"
-
 [package.extras]
 test = ["pytest"]
 
 [[package]]
-category = "dev"
-description = "A plugin for flake8 integrating mypy."
 name = "flake8-mypy"
+version = "17.8.0"
+description = "A plugin for flake8 integrating mypy."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "17.8.0"
 
 [package.dependencies]
 attrs = "*"
@@ -154,13 +148,12 @@ flake8 = ">=3.0.0"
 mypy = "*"
 
 [[package]]
-category = "dev"
-description = "Read metadata from Python packages"
-marker = "python_version < \"3.8\""
 name = "importlib-metadata"
+version = "1.6.0"
+description = "Read metadata from Python packages"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.6.0"
 
 [package.dependencies]
 zipp = ">=0.5"
@@ -170,50 +163,42 @@ docs = ["sphinx", "rst.linker"]
 testing = ["packaging", "importlib-resources"]
 
 [[package]]
-category = "dev"
-description = "Read resources from Python packages"
-marker = "python_version < \"3.7\""
 name = "importlib-resources"
+version = "1.4.0"
+description = "Read resources from Python packages"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.4.0"
 
 [package.dependencies]
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = "*"
-
-[package.dependencies.zipp]
-python = "<3.8"
-version = ">=0.4"
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+zipp = {version = ">=0.4", markers = "python_version < \"3.8\""}
 
 [package.extras]
 docs = ["sphinx", "rst.linker", "jaraco.packaging"]
 
 [[package]]
-category = "dev"
-description = "IPython: Productive Interactive Computing"
 name = "ipython"
+version = "7.16.3"
+description = "IPython: Productive Interactive Computing"
+category = "dev"
 optional = false
-python-versions = ">=3.3"
-version = "6.5.0"
+python-versions = ">=3.6"
 
 [package.dependencies]
-appnope = "*"
+appnope = {version = "*", markers = "sys_platform == \"darwin\""}
 backcall = "*"
-colorama = "*"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
 decorator = "*"
-jedi = ">=0.10"
-pexpect = "*"
+jedi = ">=0.10,<=0.17.2"
+pexpect = {version = "*", markers = "sys_platform != \"win32\""}
 pickleshare = "*"
-prompt-toolkit = ">=1.0.15,<2.0.0"
+prompt-toolkit = ">=2.0.0,<3.0.0 || >3.0.0,<3.0.1 || >3.0.1,<3.1.0"
 pygments = "*"
-setuptools = ">=18.5"
-simplegeneric = ">0.8"
 traitlets = ">=4.2"
 
 [package.extras]
-all = ["requests", "nbformat", "ipykernel", "ipyparallel", "qtconsole", "testpath", "pygments", "notebook", "nose (>=0.10.1)", "Sphinx (>=1.3)", "ipywidgets", "nbconvert"]
+all = ["Sphinx (>=1.3)", "ipykernel", "ipyparallel", "ipywidgets", "nbconvert", "nbformat", "nose (>=0.10.1)", "notebook", "numpy (>=1.14)", "pygments", "qtconsole", "requests", "testpath"]
 doc = ["Sphinx (>=1.3)"]
 kernel = ["ipykernel"]
 nbconvert = ["nbconvert"]
@@ -221,28 +206,26 @@ nbformat = ["nbformat"]
 notebook = ["notebook", "ipywidgets"]
 parallel = ["ipyparallel"]
 qtconsole = ["qtconsole"]
-test = ["nose (>=0.10.1)", "requests", "testpath", "pygments", "nbformat", "ipykernel", "numpy"]
+test = ["nose (>=0.10.1)", "requests", "testpath", "pygments", "nbformat", "ipykernel", "numpy (>=1.14)"]
 
 [[package]]
-category = "dev"
-description = "Vestigial utilities from IPython"
 name = "ipython-genutils"
+version = "0.2.0"
+description = "Vestigial utilities from IPython"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.2.0"
 
 [[package]]
-category = "dev"
-description = "A Python utility / library to sort Python imports."
 name = "isort"
+version = "4.3.21"
+description = "A Python utility / library to sort Python imports."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "4.3.21"
 
 [package.dependencies]
-[package.dependencies.toml]
-optional = true
-version = "*"
+toml = {version = "*", optional = true, markers = "extra == \"pyproject\""}
 
 [package.extras]
 pipfile = ["pipreqs", "requirementslib"]
@@ -251,43 +234,43 @@ requirements = ["pipreqs", "pip-api"]
 xdg_home = ["appdirs (>=1.4.0)"]
 
 [[package]]
-category = "dev"
-description = "An autocompletion tool for Python that can be used for text editors."
 name = "jedi"
+version = "0.16.0"
+description = "An autocompletion tool for Python that can be used for text editors."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.16.0"
 
 [package.dependencies]
 parso = ">=0.5.2"
 
 [package.extras]
-qa = ["flake8 (3.7.9)"]
-testing = ["colorama (0.4.1)", "docopt", "pytest (>=3.9.0,<5.0.0)"]
+qa = ["flake8 (==3.7.9)"]
+testing = ["colorama (==0.4.1)", "docopt", "pytest (>=3.9.0,<5.0.0)"]
 
 [[package]]
-category = "dev"
-description = "McCabe checker, plugin for flake8"
 name = "mccabe"
+version = "0.6.1"
+description = "McCabe checker, plugin for flake8"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.6.1"
 
 [[package]]
-category = "dev"
-description = "More routines for operating on iterables, beyond itertools"
 name = "more-itertools"
+version = "8.2.0"
+description = "More routines for operating on iterables, beyond itertools"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "8.2.0"
 
 [[package]]
-category = "dev"
-description = "Optional static typing for Python"
 name = "mypy"
+version = "0.770"
+description = "Optional static typing for Python"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "0.770"
 
 [package.dependencies]
 mypy-extensions = ">=0.4.3,<0.5.0"
@@ -298,43 +281,43 @@ typing-extensions = ">=3.7.4"
 dmypy = ["psutil (>=4.0)"]
 
 [[package]]
-category = "dev"
-description = "Experimental type system extensions for programs checked with the mypy typechecker."
 name = "mypy-extensions"
+version = "0.4.3"
+description = "Experimental type system extensions for programs checked with the mypy typechecker."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.4.3"
 
 [[package]]
-category = "dev"
-description = "Core utilities for Python packages"
 name = "packaging"
+version = "20.3"
+description = "Core utilities for Python packages"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.3"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
 six = "*"
 
 [[package]]
-category = "dev"
-description = "A Python Parser"
 name = "parso"
+version = "0.6.2"
+description = "A Python Parser"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.6.2"
 
 [package.extras]
 testing = ["docopt", "pytest (>=3.0.7)"]
 
 [[package]]
-category = "dev"
-description = "pdb++, a drop-in replacement for pdb"
 name = "pdbpp"
+version = "0.9.15"
+description = "pdb++, a drop-in replacement for pdb"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.9.15"
 
 [package.dependencies]
 fancycompleter = ">=0.8"
@@ -346,189 +329,180 @@ funcsigs = ["funcsigs"]
 testing = ["funcsigs", "pytest"]
 
 [[package]]
-category = "dev"
-description = "Pexpect allows easy control of interactive console applications."
-marker = "sys_platform != \"win32\""
 name = "pexpect"
+version = "4.8.0"
+description = "Pexpect allows easy control of interactive console applications."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "4.8.0"
 
 [package.dependencies]
 ptyprocess = ">=0.5"
 
 [[package]]
-category = "dev"
-description = "Tiny 'shelve'-like database with concurrency support"
 name = "pickleshare"
+version = "0.7.5"
+description = "Tiny 'shelve'-like database with concurrency support"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.7.5"
 
 [[package]]
-category = "dev"
-description = "plugin and hook calling mechanisms for python"
 name = "pluggy"
+version = "0.13.1"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.13.1"
 
 [package.dependencies]
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
 dev = ["pre-commit", "tox"]
 
 [[package]]
-category = "dev"
-description = "Library for building powerful interactive command lines in Python"
 name = "prompt-toolkit"
+version = "3.0.3"
+description = "Library for building powerful interactive command lines in Python"
+category = "dev"
 optional = false
-python-versions = "*"
-version = "1.0.18"
+python-versions = ">=3.6"
 
 [package.dependencies]
-six = ">=1.9.0"
 wcwidth = "*"
 
 [[package]]
-category = "dev"
-description = "Run a subprocess in a pseudo terminal"
-marker = "sys_platform != \"win32\""
 name = "ptyprocess"
+version = "0.6.0"
+description = "Run a subprocess in a pseudo terminal"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.6.0"
 
 [[package]]
-category = "dev"
-description = "library with cross-python path, ini-parsing, io, code, log facilities"
 name = "py"
+version = "1.8.1"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.8.1"
 
 [[package]]
-category = "dev"
-description = "Python style guide checker"
 name = "pycodestyle"
+version = "2.5.0"
+description = "Python style guide checker"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.5.0"
 
 [[package]]
-category = "dev"
-description = "passive checker of Python programs"
 name = "pyflakes"
+version = "2.1.1"
+description = "passive checker of Python programs"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.1.1"
 
 [[package]]
-category = "dev"
-description = "Pygments is a syntax highlighting package written in Python."
 name = "pygments"
+version = "2.6.1"
+description = "Pygments is a syntax highlighting package written in Python."
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "2.6.1"
 
 [[package]]
-category = "dev"
-description = "Python parsing module"
 name = "pyparsing"
+version = "2.4.7"
+description = "Python parsing module"
+category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "2.4.7"
 
 [[package]]
-category = "dev"
-description = "A python implmementation of GNU readline."
-marker = "platform_system == \"Windows\""
 name = "pyreadline"
+version = "2.1"
+description = "A python implmementation of GNU readline."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "2.1"
 
 [[package]]
-category = "dev"
-description = "A library for building flexible command line interfaces"
 name = "pyrepl"
+version = "0.9.0"
+description = "A library for building flexible command line interfaces"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.9.0"
 
 [[package]]
-category = "dev"
-description = "pytest: simple powerful testing with Python"
 name = "pytest"
+version = "5.4.1"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "5.4.1"
 
 [package.dependencies]
-atomicwrites = ">=1.0"
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
 attrs = ">=17.4.0"
-colorama = "*"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 more-itertools = ">=4.0.0"
 packaging = "*"
 pluggy = ">=0.12,<1.0"
 py = ">=1.5.0"
 wcwidth = "*"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
-
 [package.extras]
-checkqa-mypy = ["mypy (v0.761)"]
+checkqa-mypy = ["mypy (==v0.761)"]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
 [[package]]
-category = "dev"
-description = "Pytest plugin for measuring coverage."
 name = "pytest-cov"
+version = "2.8.1"
+description = "Pytest plugin for measuring coverage."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.8.1"
 
 [package.dependencies]
 coverage = ">=4.4"
 pytest = ">=3.6"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "virtualenv"]
+testing = ["fields", "hunter", "process-tests (==2.0.2)", "six", "virtualenv"]
 
 [[package]]
-category = "dev"
-description = "Pytest plugin for measuring coverage. Forked from `pytest-cov`."
 name = "pytest-cover"
+version = "3.0.0"
+description = "Pytest plugin for measuring coverage. Forked from `pytest-cov`."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "3.0.0"
 
 [package.dependencies]
 pytest-cov = ">=2.0"
 
 [[package]]
-category = "dev"
-description = "Pytest plugin for measuring coverage. Forked from `pytest-cov`."
 name = "pytest-coverage"
+version = "0.0"
+description = "Pytest plugin for measuring coverage. Forked from `pytest-cov`."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.0"
 
 [package.dependencies]
 pytest-cover = "*"
 
 [[package]]
-category = "dev"
-description = "A Django plugin for pytest."
 name = "pytest-django"
+version = "3.9.0"
+description = "A Django plugin for pytest."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "3.9.0"
 
 [package.dependencies]
 pytest = ">=3.6"
@@ -538,24 +512,24 @@ docs = ["sphinx", "sphinx-rtd-theme"]
 testing = ["django", "django-configurations (>=2.0)", "six"]
 
 [[package]]
-category = "dev"
-description = "pytest plugin to check FLAKE8 requirements"
 name = "pytest-flake8"
+version = "1.0.4"
+description = "pytest plugin to check FLAKE8 requirements"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.0.4"
 
 [package.dependencies]
 flake8 = ">=3.5"
 pytest = ">=3.5"
 
 [[package]]
-category = "dev"
-description = "Thin-wrapper around the mock package for easier use with pytest"
 name = "pytest-mock"
+version = "3.0.0"
+description = "Thin-wrapper around the mock package for easier use with pytest"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "3.0.0"
 
 [package.dependencies]
 pytest = ">=2.7"
@@ -564,28 +538,20 @@ pytest = ">=2.7"
 dev = ["pre-commit", "tox", "pytest-asyncio"]
 
 [[package]]
-category = "dev"
-description = "Simple generic functions (similar to Python's own len(), pickle.dump(), etc.)"
-name = "simplegeneric"
-optional = false
-python-versions = "*"
-version = "0.8.1"
-
-[[package]]
-category = "dev"
-description = "Python 2 and 3 compatibility utilities"
 name = "six"
+version = "1.14.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "1.14.0"
 
 [[package]]
-category = "dev"
-description = "A collection of helpers and mock objects for unit tests and doc tests."
 name = "testfixtures"
+version = "6.14.0"
+description = "A collection of helpers and mock objects for unit tests and doc tests."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "6.14.0"
 
 [package.extras]
 build = ["setuptools-git", "wheel", "twine"]
@@ -593,24 +559,25 @@ docs = ["sphinx", "zope.component", "sybil", "twisted", "mock", "django (<2)", "
 test = ["pytest (>=3.6)", "pytest-cov", "pytest-django", "zope.component", "sybil", "twisted", "mock", "django (<2)", "django"]
 
 [[package]]
-category = "dev"
-description = "Python Library for Tom's Obvious, Minimal Language"
 name = "toml"
+version = "0.10.0"
+description = "Python Library for Tom's Obvious, Minimal Language"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.10.0"
 
 [[package]]
-category = "dev"
-description = "tox is a generic virtualenv management and test command line tool"
 name = "tox"
+version = "3.14.6"
+description = "tox is a generic virtualenv management and test command line tool"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "3.14.6"
 
 [package.dependencies]
-colorama = ">=0.4.1"
+colorama = {version = ">=0.4.1", markers = "platform_system == \"Windows\""}
 filelock = ">=3.0.0,<4"
+importlib-metadata = {version = ">=0.12,<2", markers = "python_version < \"3.8\""}
 packaging = ">=14"
 pluggy = ">=0.12.0,<1"
 py = ">=1.4.17,<2"
@@ -618,21 +585,17 @@ six = ">=1.14.0,<2"
 toml = ">=0.9.4"
 virtualenv = ">=16.0.0,<20.0.0 || >20.0.0,<20.0.1 || >20.0.1,<20.0.2 || >20.0.2,<20.0.3 || >20.0.3,<20.0.4 || >20.0.4,<20.0.5 || >20.0.5,<20.0.6 || >20.0.6,<20.0.7 || >20.0.7"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12,<2"
-
 [package.extras]
 docs = ["sphinx (>=2.0.0,<3)", "towncrier (>=18.5.0)", "pygments-github-lexers (>=0.0.5)", "sphinxcontrib-autoprogram (>=0.1.5)"]
 testing = ["freezegun (>=0.3.11,<1)", "pathlib2 (>=2.3.3,<3)", "pytest (>=4.0.0,<6)", "pytest-cov (>=2.5.1,<3)", "pytest-mock (>=1.10.0,<2)", "pytest-xdist (>=1.22.2,<2)", "pytest-randomly (>=1.0.0,<4)", "flaky (>=3.4.0,<4)", "psutil (>=5.6.1,<6)"]
 
 [[package]]
-category = "dev"
-description = "Traitlets Python config system"
 name = "traitlets"
+version = "4.3.3"
+description = "Traitlets Python config system"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "4.3.3"
 
 [package.dependencies]
 decorator = "*"
@@ -643,79 +606,73 @@ six = "*"
 test = ["pytest", "mock"]
 
 [[package]]
-category = "dev"
-description = "a fork of Python 2 and 3 ast modules with type comment support"
 name = "typed-ast"
+version = "1.4.1"
+description = "a fork of Python 2 and 3 ast modules with type comment support"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.4.1"
 
 [[package]]
-category = "dev"
-description = "Backported and Experimental Type Hints for Python 3.5+"
 name = "typing-extensions"
+version = "3.7.4.2"
+description = "Backported and Experimental Type Hints for Python 3.5+"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "3.7.4.2"
 
 [[package]]
-category = "dev"
-description = "Virtual Python Environment builder"
 name = "virtualenv"
+version = "20.0.16"
+description = "Virtual Python Environment builder"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "20.0.16"
 
 [package.dependencies]
 appdirs = ">=1.4.3,<2"
 distlib = ">=0.3.0,<1"
 filelock = ">=3.0.0,<4"
+importlib-metadata = {version = ">=0.12,<2", markers = "python_version < \"3.8\""}
+importlib-resources = {version = ">=1.0,<2", markers = "python_version < \"3.7\""}
 six = ">=1.9.0,<2"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12,<2"
-
-[package.dependencies.importlib-resources]
-python = "<3.7"
-version = ">=1.0,<2"
-
 [package.extras]
 docs = ["sphinx (>=2.0.0,<3)", "sphinx-argparse (>=0.2.5,<1)", "sphinx-rtd-theme (>=0.4.3,<1)", "towncrier (>=19.9.0rc1)", "proselint (>=0.10.2,<1)"]
 testing = ["pytest (>=4.0.0,<6)", "coverage (>=4.5.1,<6)", "pytest-mock (>=2.0.0,<3)", "pytest-env (>=0.6.2,<1)", "pytest-timeout (>=1.3.4,<2)", "packaging (>=20.0)", "xonsh (>=0.9.13,<1)"]
 
 [[package]]
-category = "dev"
-description = "Measures number of Terminal column cells of wide-character codes"
 name = "wcwidth"
+version = "0.1.9"
+description = "Measures number of Terminal column cells of wide-character codes"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.1.9"
 
 [[package]]
-category = "dev"
-description = "A tool to programmatically control windows inside X"
 name = "wmctrl"
+version = "0.3"
+description = "A tool to programmatically control windows inside X"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.3"
 
 [[package]]
-category = "dev"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-marker = "python_version < \"3.8\""
 name = "zipp"
+version = "3.1.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
-version = "3.1.0"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "bd986ebfa1cd283a2f6e61ab13776039cd395508f27c6f870cc526c0ceca5b83"
+lock-version = "1.1"
 python-versions = ">=3.6"
+content-hash = "5c4a5394e735c62c44d75ab5c705fa97e63ef2532d6438c480f16ef7ffbd4e82"
 
 [metadata.files]
 appdirs = [
@@ -824,8 +781,8 @@ importlib-resources = [
     {file = "importlib_resources-1.4.0.tar.gz", hash = "sha256:4019b6a9082d8ada9def02bece4a76b131518866790d58fdda0b5f8c603b36c2"},
 ]
 ipython = [
-    {file = "ipython-6.5.0-py3-none-any.whl", hash = "sha256:007dcd929c14631f83daff35df0147ea51d1af420da303fd078343878bd5fb62"},
-    {file = "ipython-6.5.0.tar.gz", hash = "sha256:b0f2ef9eada4a68ef63ee10b6dde4f35c840035c50fd24265f8052c98947d5a4"},
+    {file = "ipython-7.16.3-py3-none-any.whl", hash = "sha256:c0427ed8bc33ac481faf9d3acf7e84e0010cdaada945e0badd1e2e74cc075833"},
+    {file = "ipython-7.16.3.tar.gz", hash = "sha256:5ac47dc9af66fc2f5530c12069390877ae372ac905edca75a92a6e363b5d7caa"},
 ]
 ipython-genutils = [
     {file = "ipython_genutils-0.2.0-py2.py3-none-any.whl", hash = "sha256:72dd37233799e619666c9f639a9da83c34013a73e8bbc79a7a6348d93c61fab8"},
@@ -891,9 +848,8 @@ pluggy = [
     {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
 ]
 prompt-toolkit = [
-    {file = "prompt_toolkit-1.0.18-py2-none-any.whl", hash = "sha256:f7eec66105baf40eda9ab026cd8b2e251337eea8d111196695d82e0c5f0af852"},
-    {file = "prompt_toolkit-1.0.18-py3-none-any.whl", hash = "sha256:37925b37a4af1f6448c76b7606e0285f79f434ad246dda007a27411cca730c6d"},
-    {file = "prompt_toolkit-1.0.18.tar.gz", hash = "sha256:dd4fca02c8069497ad931a2d09914c6b0d1b50151ce876bc15bde4c747090126"},
+    {file = "prompt_toolkit-3.0.3-py3-none-any.whl", hash = "sha256:c93e53af97f630f12f5f62a3274e79527936ed466f038953dfa379d4941f651a"},
+    {file = "prompt_toolkit-3.0.3.tar.gz", hash = "sha256:a402e9bf468b63314e37460b68ba68243d55b2f8c4d0192f85a019af3945050e"},
 ]
 ptyprocess = [
     {file = "ptyprocess-0.6.0-py2.py3-none-any.whl", hash = "sha256:d7cc528d76e76342423ca640335bd3633420dc1366f258cb31d05e865ef5ca1f"},
@@ -955,9 +911,6 @@ pytest-mock = [
     {file = "pytest-mock-3.0.0.tar.gz", hash = "sha256:a4494016753a30231f8519bfd160242a0f3c8fb82ca36e7b6f82a7fb602ac6b8"},
     {file = "pytest_mock-3.0.0-py2.py3-none-any.whl", hash = "sha256:98e02534f170e4f37d7e1abdfc5973fd4207aa609582291717f643764e71c925"},
 ]
-simplegeneric = [
-    {file = "simplegeneric-0.8.1.zip", hash = "sha256:dc972e06094b9af5b855b3df4a646395e43d1c9d0d39ed345b7393560d0b9173"},
-]
 six = [
     {file = "six-1.14.0-py2.py3-none-any.whl", hash = "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"},
     {file = "six-1.14.0.tar.gz", hash = "sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a"},
@@ -987,19 +940,28 @@ typed-ast = [
     {file = "typed_ast-1.4.1-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:269151951236b0f9a6f04015a9004084a5ab0d5f19b57de779f908621e7d8b75"},
     {file = "typed_ast-1.4.1-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:24995c843eb0ad11a4527b026b4dde3da70e1f2d8806c99b7b4a7cf491612652"},
     {file = "typed_ast-1.4.1-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7"},
+    {file = "typed_ast-1.4.1-cp36-cp36m-manylinux2014_aarch64.whl", hash = "sha256:fcf135e17cc74dbfbc05894ebca928ffeb23d9790b3167a674921db19082401f"},
     {file = "typed_ast-1.4.1-cp36-cp36m-win32.whl", hash = "sha256:4e3e5da80ccbebfff202a67bf900d081906c358ccc3d5e3c8aea42fdfdfd51c1"},
     {file = "typed_ast-1.4.1-cp36-cp36m-win_amd64.whl", hash = "sha256:249862707802d40f7f29f6e1aad8d84b5aa9e44552d2cc17384b209f091276aa"},
     {file = "typed_ast-1.4.1-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614"},
     {file = "typed_ast-1.4.1-cp37-cp37m-manylinux1_i686.whl", hash = "sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41"},
     {file = "typed_ast-1.4.1-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:bcd3b13b56ea479b3650b82cabd6b5343a625b0ced5429e4ccad28a8973f301b"},
+    {file = "typed_ast-1.4.1-cp37-cp37m-manylinux2014_aarch64.whl", hash = "sha256:f208eb7aff048f6bea9586e61af041ddf7f9ade7caed625742af423f6bae3298"},
     {file = "typed_ast-1.4.1-cp37-cp37m-win32.whl", hash = "sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe"},
     {file = "typed_ast-1.4.1-cp37-cp37m-win_amd64.whl", hash = "sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355"},
     {file = "typed_ast-1.4.1-cp38-cp38-macosx_10_15_x86_64.whl", hash = "sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6"},
     {file = "typed_ast-1.4.1-cp38-cp38-manylinux1_i686.whl", hash = "sha256:6daac9731f172c2a22ade6ed0c00197ee7cc1221aa84cfdf9c31defeb059a907"},
     {file = "typed_ast-1.4.1-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:498b0f36cc7054c1fead3d7fc59d2150f4d5c6c56ba7fb150c013fbc683a8d2d"},
+    {file = "typed_ast-1.4.1-cp38-cp38-manylinux2014_aarch64.whl", hash = "sha256:7e4c9d7658aaa1fc80018593abdf8598bf91325af6af5cce4ce7c73bc45ea53d"},
     {file = "typed_ast-1.4.1-cp38-cp38-win32.whl", hash = "sha256:715ff2f2df46121071622063fc7543d9b1fd19ebfc4f5c8895af64a77a8c852c"},
     {file = "typed_ast-1.4.1-cp38-cp38-win_amd64.whl", hash = "sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4"},
     {file = "typed_ast-1.4.1-cp39-cp39-macosx_10_15_x86_64.whl", hash = "sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34"},
+    {file = "typed_ast-1.4.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:92c325624e304ebf0e025d1224b77dd4e6393f18aab8d829b5b7e04afe9b7a2c"},
+    {file = "typed_ast-1.4.1-cp39-cp39-manylinux1_i686.whl", hash = "sha256:d648b8e3bf2fe648745c8ffcee3db3ff903d0817a01a12dd6a6ea7a8f4889072"},
+    {file = "typed_ast-1.4.1-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:fac11badff8313e23717f3dada86a15389d0708275bddf766cca67a84ead3e91"},
+    {file = "typed_ast-1.4.1-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:0d8110d78a5736e16e26213114a38ca35cb15b6515d535413b090bd50951556d"},
+    {file = "typed_ast-1.4.1-cp39-cp39-win32.whl", hash = "sha256:b52ccf7cfe4ce2a1064b18594381bccf4179c2ecf7f513134ec2f993dd4ab395"},
+    {file = "typed_ast-1.4.1-cp39-cp39-win_amd64.whl", hash = "sha256:3742b32cf1c6ef124d57f95be609c473d7ec4c14d0090e5a5e05a15269fb4d0c"},
     {file = "typed_ast-1.4.1.tar.gz", hash = "sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b"},
 ]
 typing-extensions = [
diff --git a/pyproject.toml b/pyproject.toml
index d8f3bc6..41b9727 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ python = ">=3.6"
 flake8 = "^3.7"
 flake8-isort = "^2.9"
 flake8-mypy = "^17.8"
-ipython = "^6.4"
+ipython = "^7.16"
 pdbpp = "^0.9.2"
 pytest = "^5.4"
 pytest-coverage = "^0.0.0"