[Backend Dependencies Update] Update werkzeug to 0.16.0

[pyup-bot]

This PR updates werkzeug from 0.15.4 to 0.16.0.

Changelog

0.16.0

--------------

Unreleased

-   Deprecate most top-level attributes provided by the ``werkzeug``
 module in favor of direct imports. The deprecated imports will be
 removed in version 1.0.

 For example, instead of ``import werkzeug; werkzeug.url_quote``, do
 ``from werkzeug.urls import url_quote``. A deprecation warning will
 show the correct import to use. ``werkzeug.exceptions`` and
 ``werkzeug.routing`` should also be imported instead of accessed,
 but for technical reasons can't show a warning.

 :issue:`2`, :pr:`1640`

0.15.6

--------------

Released 2019-09-04

-   Work around a bug in pip that caused the reloader to fail on
 Windows when the script was an entry point. This fixes the issue
 with Flask's `flask run` command failing with "No module named
 Scripts\flask". :issue:`1614`
-   ``ProxyFix`` trusts the ``X-Forwarded-Proto`` header by default.
 :issue:`1630`
-   The deprecated ``num_proxies`` argument to ``ProxyFix`` sets
 ``x_for``, ``x_proto``, and ``x_host`` to match 0.14 behavior. This
 is intended to make intermediate upgrades less disruptive, but the
 argument will still be removed in 1.0. :issue:`1630`

0.15.5

--------------

Released 2019-07-17

-   Fix a ``TypeError`` due to changes to ``ast.Module`` in Python 3.8.
 :issue:`1551`
-   Fix a C assertion failure in debug builds of some Python 2.7
 releases. :issue:`1553`
-   :class:`~exceptions.BadRequestKeyError` adds the ``KeyError``
 message to the description if ``e.show_exception`` is set to
 ``True``. This is a more secure default than the original 0.15.0
 behavior and makes it easier to control without losing information.
 :pr:`1592`
-   Upgrade the debugger to jQuery 3.4.1. :issue:`1581`
-   Work around an issue in some external debuggers that caused the
 reloader to fail. :issue:`1607`
-   Work around an issue where the reloader couldn't introspect a
 setuptools script installed as an egg. :issue:`1600`
-   The reloader will use ``sys.executable`` even if the script is
 marked executable, reverting a behavior intended for NixOS
 introduced in 0.15. The reloader should no longer cause
 ``OSError: [Errno 8] Exec format error``. :issue:`1482`,
 :issue:`1580`
-   ``SharedDataMiddleware`` safely handles paths with Windows drive
 names. :issue:`1589`

Links

• PyPI: https://pypi.org/project/werkzeug
• Changelog: https://pyup.io/changelogs/werkzeug/
• Homepage: https://palletsprojects.com/p/werkzeug/

[pyup-bot]

Closing this in favor of #796