diff --git a/Pipfile.lock b/Pipfile.lock
index 4e2562a..04e2f7c 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -19,31 +19,31 @@
     "develop": {
         "appdirs": {
             "hashes": [
-                "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92",
-                "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"
+                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
+                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
             ],
-            "version": "==1.4.3"
+            "version": "==1.4.4"
         },
         "aspy.yaml": {
             "hashes": [
-                "sha256:ae249074803e8b957c83fdd82a99160d0d6d26dff9ba81ba608b42eebd7d8cd3",
-                "sha256:c7390d79f58eb9157406966201abf26da0d56c07e0ff0deadc39c8f4dbc13482"
+                "sha256:463372c043f70160a9ec950c3f1e4c3a82db5fca01d334b6bc89c7164d744bdc",
+                "sha256:e7c742382eff2caed61f87a39d13f99109088e5e93f04d76eb8d4b28aa143f45"
             ],
-            "version": "==1.2.0"
+            "version": "==1.3.0"
         },
         "atomicwrites": {
             "hashes": [
-                "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4",
-                "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"
+                "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197",
+                "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"
             ],
-            "version": "==1.3.0"
+            "version": "==1.4.0"
         },
         "attrs": {
             "hashes": [
-                "sha256:69c0dbf2ed392de1cb5ec704444b08a5ef81680a61cb899dc08127123af36a79",
-                "sha256:f0b870f674851ecbfbbbd364d6b5cbdff9dcedbc7f3f5e18a6891057f21fe399"
+                "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
             ],
-            "version": "==19.1.0"
+            "version": "==20.3.0"
         },
         "black": {
             "hashes": [
@@ -55,51 +55,81 @@
         },
         "cfgv": {
             "hashes": [
-                "sha256:6e9f2feea5e84bc71e56abd703140d7a2c250fc5ba38b8702fd6a68ed4e3b2ef",
-                "sha256:e7f186d4a36c099a9e20b04ac3108bd8bb9b9257e692ce18c8c3764d5cb12172"
+                "sha256:32e43d604bbe7896fe7c248a9c2276447dbef840feb28fe20494f62af110211d",
+                "sha256:cf22deb93d4bcf92f345a5c3cd39d3d41d6340adc60c78bbbd6588c384fda6a1"
             ],
-            "version": "==1.6.0"
+            "version": "==3.2.0"
         },
         "click": {
             "hashes": [
-                "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13",
-                "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"
+                "sha256:06b3a46da3b40f4bbe19b8ea5ba9a34e7925913a9b51608ff0c1d78ef0b814b4",
+                "sha256:7340a8666a3e2eff5f2ee778c2d06b606ce9891a61b2ee315e0a3994ffd2226a"
             ],
-            "version": "==7.0"
+            "version": "==8.0.0rc1"
         },
         "coverage": {
             "hashes": [
-                "sha256:029c69deaeeeae1b15bc6c59f0ffa28aa8473721c614a23f2c2976dec245cd12",
-                "sha256:02abbbebc6e9d5abe13cd28b5e963dedb6ffb51c146c916d17b18f141acd9947",
-                "sha256:1bbfe5b82a3921d285e999c6d256c1e16b31c554c29da62d326f86c173d30337",
-                "sha256:210c02f923df33a8d0e461c86fdcbbb17228ff4f6d92609fc06370a98d283c2d",
-                "sha256:2d0807ba935f540d20b49d5bf1c0237b90ce81e133402feda906e540003f2f7a",
-                "sha256:35d7a013874a7c927ce997350d314144ffc5465faf787bb4e46e6c4f381ef562",
-                "sha256:3636f9d0dcb01aed4180ef2e57a4e34bb4cac3ecd203c2a23db8526d86ab2fb4",
-                "sha256:42f4be770af2455a75e4640f033a82c62f3fb0d7a074123266e143269d7010ef",
-                "sha256:48440b25ba6cda72d4c638f3a9efa827b5b87b489c96ab5f4ff597d976413156",
-                "sha256:4dac8dfd1acf6a3ac657475dfdc66c621f291b1b7422a939cc33c13ac5356473",
-                "sha256:4e8474771c69c2991d5eab65764289a7dd450bbea050bc0ebb42b678d8222b42",
-                "sha256:551f10ddfeff56a1325e5a34eff304c5892aa981fd810babb98bfee77ee2fb17",
-                "sha256:5b104982f1809c1577912519eb249f17d9d7e66304ad026666cb60a5ef73309c",
-                "sha256:5c62aef73dfc87bfcca32cee149a1a7a602bc74bac72223236b0023543511c88",
-                "sha256:633151f8d1ad9467b9f7e90854a7f46ed8f2919e8bc7d98d737833e8938fc081",
-                "sha256:772207b9e2d5bf3f9d283b88915723e4e92d9a62c83f44ec92b9bd0cd685541b",
-                "sha256:7d5e02f647cd727afc2659ec14d4d1cc0508c47e6cfb07aea33d7aa9ca94d288",
-                "sha256:a9798a4111abb0f94584000ba2a2c74841f2cfe5f9254709756367aabbae0541",
-                "sha256:b38ea741ab9e35bfa7015c93c93bbd6a1623428f97a67083fc8ebd366238b91f",
-                "sha256:b6a5478c904236543c0347db8a05fac6fc0bd574c870e7970faa88e1d9890044",
-                "sha256:c6248bfc1de36a3844685a2e10ba17c18119ba6252547f921062a323fb31bff1",
-                "sha256:c705ab445936457359b1424ef25ccc0098b0491b26064677c39f1d14a539f056",
-                "sha256:d95a363d663ceee647291131dbd213af258df24f41350246842481ec3709bd33",
-                "sha256:e27265eb80cdc5dab55a40ef6f890e04ecc618649ad3da5265f128b141f93f78",
-                "sha256:ebc276c9cb5d917bd2ae959f84ffc279acafa9c9b50b0fa436ebb70bbe2166ea",
-                "sha256:f4d229866d030863d0fe3bf297d6d11e6133ca15bbb41ed2534a8b9a3d6bd061",
-                "sha256:f95675bd88b51474d4fe5165f3266f419ce754ffadfb97f10323931fa9ac95e5",
-                "sha256:f95bc54fb6d61b9f9ff09c4ae8ff6a3f5edc937cda3ca36fc937302a7c152bf1",
-                "sha256:fd0f6be53de40683584e5331c341e65a679dbe5ec489a0697cec7c2ef1a48cda"
-            ],
-            "version": "==5.0a4"
+                "sha256:00368e6328ebff76197fff5f4d5704b44098f89d8d99a67a349ad6674ec0b157",
+                "sha256:0389690e0a1c94e9a246dc3130355d70805e51ca509db1bf07fbde27efb33aa4",
+                "sha256:065d2181f44392893d37d0a4f9ff60b485d705f733356d0a2fb292a58c6f2e0f",
+                "sha256:082febdba717c769da92d5e19e14a659ebef6daab19b67fced304b7b8d2475e2",
+                "sha256:0a35ae0d590effb7cc96e7d6935ae2ab8a51526a111fbe0f12d1671aa9fdc377",
+                "sha256:142493f0400a0bd5acf03c52971229e937323c3e24c372800ae1c44a503e0921",
+                "sha256:186f53367a08e8d24cc534c7cbfa43a82d1618a48dec2e0c56e80577ec1888fe",
+                "sha256:2163a00bcd613e95e118c01ea2811f705fbbacf1904d657b24d306879e2303d3",
+                "sha256:24ecf342b1e23de259d81b3adc83578935babeb54f6950c9bd9534b12443a49c",
+                "sha256:2c24d3e09f433817ddd0cb2e8f82f8b42cd09a8ac558462fedf99be479ed4851",
+                "sha256:2d741575de4a13869c9d4a685235bacc897c94afd3703e2ad4fdc362f37e87da",
+                "sha256:305ca73c09dd84054a3a8f53d5b70e0325b5b303245d0b96ed505698dc7e8ea7",
+                "sha256:4bf1d0a390de707f8bfd49efdcdac9366ce77ed64cb35b344f58b1ec62517317",
+                "sha256:50d90d6b753debb7568621125aad4e5fb418e7bdcb0dba3fa6f4ee82994b35d4",
+                "sha256:5a2079bca21fa959608223b90cf2f95ce686a6497fb12bfaaa7bb24c3e298199",
+                "sha256:60c6d433f0357db7ed2a2a698fb75b8ce919ce547d6d6bc79c576e090f509768",
+                "sha256:66cfae29bccea703f02d8997f60d71e236c5a321588f5aa5a318bd88ca23dc0a",
+                "sha256:6d6fc990962559de1f3685eb3e365ca60f2e3257bfd145bf675c566b8ebb1944",
+                "sha256:703b126f3ad20c463b545e199c4da460695630da5fdfd949de6a6269b45eabab",
+                "sha256:730cee22c41852b90948343cdfd183db1e96a9de69fd4dabec3532c582afea68",
+                "sha256:7e4a16bde8a3b7424b2955130f5a6c29e741e7138fe05c5d9d72efc356076a80",
+                "sha256:801e8277958bc2e6cc1f2443a20a2a97f79583aa64524b130e1c0de44c287ca9",
+                "sha256:80baa69a78d5696c60b72dee44ac3d5ccf75ee82e84d018938ddf642d036a6a8",
+                "sha256:80c00ce9cef80afbf18d16cb3052f5601ba8d087501d829169eecb33c153346a",
+                "sha256:89db5a374d793344087732207ee15869549486b2148e3e2e6effe22146351fcd",
+                "sha256:917b98cc5725ea2e0b88c74d34182589a9be07092cb35b861ea9e74189174f71",
+                "sha256:9398f8fd89f6f260e94e57559df1885b8200b18312824b617a8789e0f5e7dc74",
+                "sha256:95b6f212bb0c7379f1f2f6e47c722fbdc7355d8b7488a68649e83dfa29522704",
+                "sha256:9f23313f3e494475581d46de3b8b6bdcf618ee1df412490e779a9aa0a6c72162",
+                "sha256:9f6f26e5b129bb0218aab30d368d6ead750517a457986f8854b1df4b4c318098",
+                "sha256:a502693c83a2c6558bc45b4c2dc01a00c9b99cb3cf846913438933a44af174fc",
+                "sha256:aa4999130a8e892fa9051edc18bf4daa0a2839d3f3de2dcfcbf0ae4619ee3b5e",
+                "sha256:b10be0b80784c1beb8061e5ce938d8511a182125de5fc695a60f0561b984d361",
+                "sha256:b1f7b23a606aaf2464eb81c23b5b20623e2ba44b4aaca6ea9bfe00e84a1a5264",
+                "sha256:b78c8d232d97dbc8ad3a3d94cc15fccabe9a331685d76d2e5cb5284acc4a5feb",
+                "sha256:b88fa862817035ad7921f2641c27a85dab12cc685ad3ef29c0caaf5b3d10a868",
+                "sha256:b93fb9137070899b5f10d6487724f4427b5945983a785e1e2f1102c5e175c516",
+                "sha256:b9639e16c1bc4eb8a78b3b30df4146bb78df5d52ba1b7454b634abd89aede6cc",
+                "sha256:baa3b6be365c97f80d92a397cb8963dcd9bc22d101b39784e77a9cad093812f8",
+                "sha256:c06c5758bae454a49dc3e7917804b46c31bb4a72cedfc8e7b4f17a318b3de9d6",
+                "sha256:c544153709e93ea7e9edcefee72f5afcf484a9cb526067065f9419419f4a3694",
+                "sha256:c6c74260ba130f7c20a340e8f9e544b0941621641f53edcf69e4602e12c9f29e",
+                "sha256:d040615ff5c02ffd97ba9f0f73b9db34c09b8142fbfdd363b2a79fa6a554242c",
+                "sha256:d85774b1ac09ec1d958e63baa436cc4c90e2e910294847ba51dcc3ca3ca04a63",
+                "sha256:e508bb216eee8350e77b436f9f99c4f2d8335ecb51483f5ffd8bf5e84aaa56d1",
+                "sha256:ea1cb38b1a52392ebb4e93eaf4a44b3cfdec35cca3f78a9a599f27b7f27031e2",
+                "sha256:ec310e0029d530d1043f638b7a326b349884421572626bc2909408da7b0d03e5",
+                "sha256:ed04b79f53fa975660f1a598120c504a0f4529170eeaf0d823fcc1f06f4d2e0f",
+                "sha256:f4909ee1ddabed351f0fa55063a7dbe498001e2245a9602d9fb0fd74afecdca9",
+                "sha256:f49ae9e19737493911e7f8e551310f719f463e442ea1ec92fe0804c62066a7e8",
+                "sha256:f4c93e6102087dda4931fcd50fa4ad44e8e43e09419290c5f05cc2c690961ebf",
+                "sha256:fa1b639d85af4794cb20d7cfd4c5ae38e94a418b17a2318a1992b470fb68260d"
+            ],
+            "version": "==5.6b1"
+        },
+        "distlib": {
+            "hashes": [
+                "sha256:8c09de2c67b3e7deef7184574fc060ab8a793e7adbb183d942c389c8b13c52fb",
+                "sha256:edf6116872c863e1aa9d5bb7cb5e05a022c519a4594dc703843343a9ddd9bff1"
+            ],
+            "version": "==0.3.1"
         },
         "entrypoints": {
             "hashes": [
@@ -108,6 +138,13 @@
             ],
             "version": "==0.3"
         },
+        "filelock": {
+            "hashes": [
+                "sha256:18d82244ee114f543149c66a6e0c14e9c4f8a1044b5cdaadd0f82159d6a6ff59",
+                "sha256:929b7d63ec5b7d6b71b0fa5ac14e030b3f70b75747cef1b10da9b879fef15836"
+            ],
+            "version": "==3.0.12"
+        },
         "flake8": {
             "hashes": [
                 "sha256:859996073f341f2670741b51ec1e67a01da142831aa1fdc6242dbf88dffbe661",
@@ -126,17 +163,18 @@
         },
         "identify": {
             "hashes": [
-                "sha256:244e7864ef59f0c7c50c6db73f58564151d91345cd9b76ed793458953578cadd",
-                "sha256:8ff062f90ad4b09cfe79b5dfb7a12e40f19d2e68a5c9598a49be45f16aba7171"
+                "sha256:398cb92a7599da0b433c65301a1b62b9b1f4bb8248719b84736af6c0b22289d6",
+                "sha256:4537474817e0bbb8cea3e5b7504b7de6d44e3f169a90846cbc6adb0fc8294502"
             ],
-            "version": "==1.4.1"
+            "version": "==2.2.3"
         },
         "importlib-metadata": {
             "hashes": [
-                "sha256:46fc60c34b6ed7547e2a723fc8de6dc2e3a1173f8423246b3ce497f064e9c3de",
-                "sha256:bc136180e961875af88b1ab85b4009f4f1278f8396a60526c0009f503a1a96ca"
+                "sha256:19192b88d959336bfa6bdaaaef99aeafec179eca19c47c804e555703ee5f07ef",
+                "sha256:2e881981c9748d7282b374b68e759c87745c25427b67ecf0cc67fb6637a1bff9"
             ],
-            "version": "==0.9"
+            "markers": "python_version < '3.8'",
+            "version": "==4.0.0"
         },
         "mccabe": {
             "hashes": [
@@ -147,11 +185,11 @@
         },
         "more-itertools": {
             "hashes": [
-                "sha256:2112d2ca570bb7c3e53ea1a35cd5df42bb0fd10c45f0fb97178679c3c03d64c7",
-                "sha256:c3e4748ba1aad8dba30a4886b0b1a2004f9a863837b8654e7059eebf727afa5a"
+                "sha256:5652a9ac72209ed7df8d9c15daf4e1aa0e3d2ccd3c87f8265a0673cd9cbc9ced",
+                "sha256:c5d6da9ca3ff65220c3bfd2a8db06d698f05d4d2b9be57e1deb2be5a45019713"
             ],
             "markers": "python_version > '2.7'",
-            "version": "==7.0.0"
+            "version": "==8.7.0"
         },
         "mypy": {
             "hashes": [
@@ -172,23 +210,24 @@
         },
         "mypy-extensions": {
             "hashes": [
-                "sha256:37e0e956f41369209a3d5f34580150bcacfabaa57b33a15c0b25f4b5725e0812",
-                "sha256:b16cabe759f55e3409a7d231ebd2841378fb0c27a5d1994719e340e4f429ac3e"
+                "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d",
+                "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"
             ],
-            "version": "==0.4.1"
+            "version": "==0.4.3"
         },
         "nodeenv": {
             "hashes": [
-                "sha256:ad8259494cf1c9034539f6cced78a1da4840a4b157e23640bc4a0c0546b0cb7a"
+                "sha256:3ef13ff90291ba2a4a7a4ff9a979b63ffdd00a464dbe04acf0ea6471517a4c2b",
+                "sha256:621e6b7076565ddcacd2db0294c0381e01fd28945ab36bcf00f41c5daf63bef7"
             ],
-            "version": "==1.3.3"
+            "version": "==1.6.0"
         },
         "pluggy": {
             "hashes": [
-                "sha256:19ecf9ce9db2fce065a7a0586e07cfb4ac8614fe96edf628a264b1c70116cf8f",
-                "sha256:84d306a647cc805219916e62aab89caa97a33a1dd8c342e87a37f91073cd4746"
+                "sha256:265a94bf44ca13662f12fcd1b074c14d4b269a712f051b6f644ef7e705d6735f",
+                "sha256:467f0219e89bb5061a8429c6fc5cf055fa3983a0e68e84a1d205046306b37d9e"
             ],
-            "version": "==0.9.0"
+            "version": "==1.0.0.dev0"
         },
         "pre-commit": {
             "hashes": [
@@ -200,10 +239,11 @@
         },
         "py": {
             "hashes": [
-                "sha256:64f65755aee5b381cea27766a3a147c3f15b9b6b9ac88676de66ba2ae36793fa",
-                "sha256:dc639b046a6e2cff5bbe40194ad65936d6ba360b52b3c3fe1d08a82dd50b5e53"
+                "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
+                "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
             ],
-            "version": "==1.8.0"
+            "index": "pypi",
+            "version": "==1.10.0"
         },
         "pycodestyle": {
             "hashes": [
@@ -237,71 +277,98 @@
         },
         "pyyaml": {
             "hashes": [
-                "sha256:1adecc22f88d38052fb787d959f003811ca858b799590a5eaa70e63dca50308c",
-                "sha256:436bc774ecf7c103814098159fbb84c2715d25980175292c648f2da143909f95",
-                "sha256:460a5a4248763f6f37ea225d19d5c205677d8d525f6a83357ca622ed541830c2",
-                "sha256:5a22a9c84653debfbf198d02fe592c176ea548cccce47553f35f466e15cf2fd4",
-                "sha256:7a5d3f26b89d688db27822343dfa25c599627bc92093e788956372285c6298ad",
-                "sha256:9372b04a02080752d9e6f990179a4ab840227c6e2ce15b95e1278456664cf2ba",
-                "sha256:a5dcbebee834eaddf3fa7366316b880ff4062e4bcc9787b78c7fbb4a26ff2dd1",
-                "sha256:aee5bab92a176e7cd034e57f46e9df9a9862a71f8f37cad167c6fc74c65f5b4e",
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 }