diff --git a/Pipfile.lock b/Pipfile.lock
index cc78384..47be31a 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -19,17 +19,17 @@
     "develop": {
         "appdirs": {
             "hashes": [
-                "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92",
-                "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"
+                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
+                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
             ],
-            "version": "==1.4.3"
+            "version": "==1.4.4"
         },
         "attrs": {
             "hashes": [
-                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
-                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
+                "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
             ],
-            "version": "==19.3.0"
+            "version": "==20.3.0"
         },
         "black": {
             "hashes": [
@@ -41,59 +41,81 @@
         },
         "cfgv": {
             "hashes": [
-                "sha256:1ccf53320421aeeb915275a196e23b3b8ae87dea8ac6698b1638001d4a486d53",
-                "sha256:c8e8f552ffcc6194f4e18dd4f68d9aef0c0d58ae7e7be8c82bee3c5e9edfa513"
+                "sha256:32e43d604bbe7896fe7c248a9c2276447dbef840feb28fe20494f62af110211d",
+                "sha256:cf22deb93d4bcf92f345a5c3cd39d3d41d6340adc60c78bbbd6588c384fda6a1"
             ],
-            "version": "==3.1.0"
+            "version": "==3.2.0"
         },
         "click": {
             "hashes": [
-                "sha256:8a18b4ea89d8820c5d0c7da8a64b2c324b4dabb695804dbfea19b9be9d88c0cc",
-                "sha256:e345d143d80bf5ee7534056164e5e112ea5e22716bbb1ce727941f4c8b471b9a"
+                "sha256:681c9380a24b22fec089c8e5ffe40aa16a0da79f248a26fe2481bfa8170bfcc1",
+                "sha256:e4315a188403c0258bbc4a4e31863e48fc301c4e95b8007a8eeda0391158df13"
             ],
-            "version": "==7.1.1"
+            "version": "==8.0.0a1"
         },
         "coverage": {
             "hashes": [
-                "sha256:03f630aba2b9b0d69871c2e8d23a69b7fe94a1e2f5f10df5049c0df99db639a0",
-                "sha256:046a1a742e66d065d16fb564a26c2a15867f17695e7f3d358d7b1ad8a61bca30",
-                "sha256:0a907199566269e1cfa304325cc3b45c72ae341fbb3253ddde19fa820ded7a8b",
-                "sha256:165a48268bfb5a77e2d9dbb80de7ea917332a79c7adb747bd005b3a07ff8caf0",
-                "sha256:1b60a95fc995649464e0cd48cecc8288bac5f4198f21d04b8229dc4097d76823",
-                "sha256:1f66cf263ec77af5b8fe14ef14c5e46e2eb4a795ac495ad7c03adc72ae43fafe",
-                "sha256:2e08c32cbede4a29e2a701822291ae2bc9b5220a971bba9d1e7615312efd3037",
-                "sha256:3844c3dab800ca8536f75ae89f3cf566848a3eb2af4d9f7b1103b4f4f7a5dad6",
-                "sha256:408ce64078398b2ee2ec08199ea3fcf382828d2f8a19c5a5ba2946fe5ddc6c31",
-                "sha256:443be7602c790960b9514567917af538cac7807a7c0c0727c4d2bbd4014920fd",
-                "sha256:4482f69e0701139d0f2c44f3c395d1d1d37abd81bfafbf9b6efbe2542679d892",
-                "sha256:4a8a259bf990044351baf69d3b23e575699dd60b18460c71e81dc565f5819ac1",
-                "sha256:513e6526e0082c59a984448f4104c9bf346c2da9961779ede1fc458e8e8a1f78",
-                "sha256:5f587dfd83cb669933186661a351ad6fc7166273bc3e3a1531ec5c783d997aac",
-                "sha256:62061e87071497951155cbccee487980524d7abea647a1b2a6eb6b9647df9006",
-                "sha256:641e329e7f2c01531c45c687efcec8aeca2a78a4ff26d49184dce3d53fc35014",
-                "sha256:65a7e00c00472cd0f59ae09d2fb8a8aaae7f4a0cf54b2b74f3138d9f9ceb9cb2",
-                "sha256:6ad6ca45e9e92c05295f638e78cd42bfaaf8ee07878c9ed73e93190b26c125f7",
-                "sha256:73aa6e86034dad9f00f4bbf5a666a889d17d79db73bc5af04abd6c20a014d9c8",
-                "sha256:7c9762f80a25d8d0e4ab3cb1af5d9dffbddb3ee5d21c43e3474c84bf5ff941f7",
-                "sha256:85596aa5d9aac1bf39fe39d9fa1051b0f00823982a1de5766e35d495b4a36ca9",
-                "sha256:86a0ea78fd851b313b2e712266f663e13b6bc78c2fb260b079e8b67d970474b1",
-                "sha256:8a620767b8209f3446197c0e29ba895d75a1e272a36af0786ec70fe7834e4307",
-                "sha256:922fb9ef2c67c3ab20e22948dcfd783397e4c043a5c5fa5ff5e9df5529074b0a",
-                "sha256:9fad78c13e71546a76c2f8789623eec8e499f8d2d799f4b4547162ce0a4df435",
-                "sha256:a37c6233b28e5bc340054cf6170e7090a4e85069513320275a4dc929144dccf0",
-                "sha256:c3fc325ce4cbf902d05a80daa47b645d07e796a80682c1c5800d6ac5045193e5",
-                "sha256:cda33311cb9fb9323958a69499a667bd728a39a7aa4718d7622597a44c4f1441",
-                "sha256:db1d4e38c9b15be1521722e946ee24f6db95b189d1447fa9ff18dd16ba89f732",
-                "sha256:eda55e6e9ea258f5e4add23bcf33dc53b2c319e70806e180aecbff8d90ea24de",
-                "sha256:f372cdbb240e09ee855735b9d85e7f50730dcfb6296b74b95a3e5dea0615c4c1"
-            ],
-            "version": "==5.0.4"
+                "sha256:004d1880bed2d97151facef49f08e255a20ceb6f9432df75f4eef018fdd5a78c",
+                "sha256:01d84219b5cdbfc8122223b39a954820929497a1cb1422824bb86b07b74594b6",
+                "sha256:040af6c32813fa3eae5305d53f18875bedd079960822ef8ec067a66dd8afcd45",
+                "sha256:06191eb60f8d8a5bc046f3799f8a07a2d7aefb9504b0209aff0b47298333302a",
+                "sha256:13034c4409db851670bc9acd836243aeee299949bd5673e11844befcb0149f03",
+                "sha256:13c4ee887eca0f4c5a247b75398d4114c37882658300e153113dafb1d76de529",
+                "sha256:184a47bbe0aa6400ed2d41d8e9ed868b8205046518c52464fde713ea06e3a74a",
+                "sha256:18ba8bbede96a2c3dde7b868de9dcbd55670690af0988713f0603f037848418a",
+                "sha256:1aa846f56c3d49205c952d8318e76ccc2ae23303351d9270ab220004c580cfe2",
+                "sha256:217658ec7187497e3f3ebd901afdca1af062b42cfe3e0dafea4cced3983739f6",
+                "sha256:24d4a7de75446be83244eabbff746d66b9240ae020ced65d060815fac3423759",
+                "sha256:2910f4d36a6a9b4214bb7038d537f015346f413a975d57ca6b43bf23d6563b53",
+                "sha256:2949cad1c5208b8298d5686d5a85b66aae46d73eec2c3e08c817dd3513e5848a",
+                "sha256:2a3859cb82dcbda1cfd3e6f71c27081d18aa251d20a17d87d26d4cd216fb0af4",
+                "sha256:2cafbbb3af0733db200c9b5f798d18953b1a304d3f86a938367de1567f4b5bff",
+                "sha256:2e0d881ad471768bf6e6c2bf905d183543f10098e3b3640fc029509530091502",
+                "sha256:30c77c1dc9f253283e34c27935fded5015f7d1abe83bc7821680ac444eaf7793",
+                "sha256:3487286bc29a5aa4b93a072e9592f22254291ce96a9fbc5251f566b6b7343cdb",
+                "sha256:372da284cfd642d8e08ef606917846fa2ee350f64994bebfbd3afb0040436905",
+                "sha256:41179b8a845742d1eb60449bdb2992196e211341818565abded11cfa90efb821",
+                "sha256:44d654437b8ddd9eee7d1eaee28b7219bec228520ff809af170488fd2fed3e2b",
+                "sha256:4a7697d8cb0f27399b0e393c0b90f0f1e40c82023ea4d45d22bce7032a5d7b81",
+                "sha256:51cb9476a3987c8967ebab3f0fe144819781fca264f57f89760037a2ea191cb0",
+                "sha256:52596d3d0e8bdf3af43db3e9ba8dcdaac724ba7b5ca3f6358529d56f7a166f8b",
+                "sha256:53194af30d5bad77fcba80e23a1441c71abfb3e01192034f8246e0d8f99528f3",
+                "sha256:5fec2d43a2cc6965edc0bb9e83e1e4b557f76f843a77a2496cbe719583ce8184",
+                "sha256:6c90e11318f0d3c436a42409f2749ee1a115cd8b067d7f14c148f1ce5574d701",
+                "sha256:74d881fc777ebb11c63736622b60cb9e4aee5cace591ce274fb69e582a12a61a",
+                "sha256:7501140f755b725495941b43347ba8a2777407fc7f250d4f5a7d2a1050ba8e82",
+                "sha256:796c9c3c79747146ebd278dbe1e5c5c05dd6b10cc3bcb8389dfdf844f3ead638",
+                "sha256:869a64f53488f40fa5b5b9dcb9e9b2962a66a87dab37790f3fcfb5144b996ef5",
+                "sha256:8963a499849a1fc54b35b1c9f162f4108017b2e6db2c46c1bed93a72262ed083",
+                "sha256:8d0a0725ad7c1a0bcd8d1b437e191107d457e2ec1084b9f190630a4fb1af78e6",
+                "sha256:900fbf7759501bc7807fd6638c947d7a831fc9fdf742dc10f02956ff7220fa90",
+                "sha256:92b017ce34b68a7d67bd6d117e6d443a9bf63a2ecf8567bb3d8c6c7bc5014465",
+                "sha256:970284a88b99673ccb2e4e334cfb38a10aab7cd44f7457564d11898a74b62d0a",
+                "sha256:972c85d205b51e30e59525694670de6a8a89691186012535f9d7dbaa230e42c3",
+                "sha256:9a1ef3b66e38ef8618ce5fdc7bea3d9f45f3624e2a66295eea5e57966c85909e",
+                "sha256:af0e781009aaf59e25c5a678122391cb0f345ac0ec272c7961dc5455e1c40066",
+                "sha256:b6d534e4b2ab35c9f93f46229363e17f63c53ad01330df9f2d6bd1187e5eaacf",
+                "sha256:b7895207b4c843c76a25ab8c1e866261bcfe27bfaa20c192de5190121770672b",
+                "sha256:c0891a6a97b09c1f3e073a890514d5012eb256845c451bd48f7968ef939bf4ae",
+                "sha256:c2723d347ab06e7ddad1a58b2a821218239249a9e4365eaff6649d31180c1669",
+                "sha256:d1f8bf7b90ba55699b3a5e44930e93ff0189aa27186e96071fac7dd0d06a1873",
+                "sha256:d1f9ce122f83b2305592c11d64f181b87153fc2c2bbd3bb4a3dde8303cfb1a6b",
+                "sha256:d314ed732c25d29775e84a960c3c60808b682c08d86602ec2c3008e1202e3bb6",
+                "sha256:d636598c8305e1f90b439dbf4f66437de4a5e3c31fdf47ad29542478c8508bbb",
+                "sha256:deee1077aae10d8fa88cb02c845cfba9b62c55e1183f52f6ae6a2df6a2187160",
+                "sha256:ebe78fe9a0e874362175b02371bdfbee64d8edc42a044253ddf4ee7d3c15212c",
+                "sha256:f030f8873312a16414c0d8e1a1ddff2d3235655a2174e3648b4fa66b3f2f1079",
+                "sha256:f0b278ce10936db1a37e6954e15a3730bea96a0997c26d7fee88e6c396c2086d",
+                "sha256:f11642dddbb0253cc8853254301b51390ba0081750a8ac03f20ea8103f0c56b6"
+            ],
+            "version": "==5.5"
         },
         "distlib": {
             "hashes": [
-                "sha256:2e166e231a26b36d6dfe35a48c4464346620f8645ed0ace01ee31822b288de21"
+                "sha256:8c09de2c67b3e7deef7184574fc060ab8a793e7adbb183d942c389c8b13c52fb",
+                "sha256:edf6116872c863e1aa9d5bb7cb5e05a022c519a4594dc703843343a9ddd9bff1"
             ],
-            "version": "==0.3.0"
+            "version": "==0.3.1"
         },
         "filelock": {
             "hashes": [
@@ -104,10 +126,10 @@
         },
         "identify": {
             "hashes": [
-                "sha256:a7577a1f55cee1d21953a5cf11a3c839ab87f5ef909a4cba6cf52ed72b4c6059",
-                "sha256:ab246293e6585a1c6361a505b68d5b501a0409310932b7de2c2ead667b564d89"
+                "sha256:1cfb05b578de996677836d5a2dde14b3dffde313cf7d2b3e793a0787a36e26dd",
+                "sha256:9cc5f58996cd359b7b72f0a5917d8639de5323917e6952a3bfbf36301b576f40"
             ],
-            "version": "==1.4.13"
+            "version": "==2.2.1"
         },
         "isort": {
             "hashes": [
@@ -126,10 +148,10 @@
         },
         "more-itertools": {
             "hashes": [
-                "sha256:5dd8bcf33e5f9513ffa06d5ad33d78f31e1931ac9a18f33d37e77a180d393a7c",
-                "sha256:b1ddb932186d8a6ac451e1d95844b382f55e12686d51ca0c68b6f61f2ab7a507"
+                "sha256:5652a9ac72209ed7df8d9c15daf4e1aa0e3d2ccd3c87f8265a0673cd9cbc9ced",
+                "sha256:c5d6da9ca3ff65220c3bfd2a8db06d698f05d4d2b9be57e1deb2be5a45019713"
             ],
-            "version": "==8.2.0"
+            "version": "==8.7.0"
         },
         "mypy": {
             "hashes": [
@@ -160,23 +182,24 @@
         },
         "nodeenv": {
             "hashes": [
-                "sha256:5b2438f2e42af54ca968dd1b374d14a1194848955187b0e5e4be1f73813a5212"
+                "sha256:5304d424c529c997bc888453aeaa6362d242b6b4631e90f3d4bf1b290f1c84a9",
+                "sha256:ab45090ae383b716c4ef89e690c41ff8c2b257b85b309f01f3654df3d084bd7c"
             ],
-            "version": "==1.3.5"
+            "version": "==1.5.0"
         },
         "packaging": {
             "hashes": [
-                "sha256:3c292b474fda1671ec57d46d739d072bfd495a4f51ad01a055121d81e952b7a3",
-                "sha256:82f77b9bee21c1bafbf35a84905d604d5d1223801d639cf3ed140bd651c08752"
+                "sha256:5b327ac1320dc863dca72f4514ecc086f31186744b84a230374cc1fd776feae5",
+                "sha256:67714da7f7bc052e064859c05c595155bd1ee9f69f76557e21f051443c20947a"
             ],
-            "version": "==20.3"
+            "version": "==20.9"
         },
         "pathspec": {
             "hashes": [
-                "sha256:163b0632d4e31cef212976cf57b43d9fd6b0bac6e67c26015d611a647d5e7424",
-                "sha256:562aa70af2e0d434367d9790ad37aed893de47f1693e4201fd1d3dca15d19b96"
+                "sha256:86379d6b86d75816baba717e64b1a3a3469deb93bb76d613c9ce79edc5cb68fd",
+                "sha256:aa0cb481c4041bf52ffa7b0d8fa6cd3e88a2ca4879c533c9153882ee2556790d"
             ],
-            "version": "==0.7.0"
+            "version": "==0.8.1"
         },
         "pluggy": {
             "hashes": [
@@ -195,31 +218,31 @@
         },
         "py": {
             "hashes": [
-                "sha256:5e27081401262157467ad6e7f851b7aa402c5852dbcb3dae06768434de5752aa",
-                "sha256:c20fdd83a5dbc0af9efd622bee9a5564e278f6380fffcacc43ba6f43db2813b0"
+                "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
+                "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
             ],
-            "version": "==1.8.1"
+            "version": "==1.10.0"
         },
         "pycodestyle": {
             "hashes": [
-                "sha256:95a2219d12372f05704562a14ec30bc76b05a5b297b21a5dfe3f6fac3491ae56",
-                "sha256:e40a936c9a450ad81df37f549d676d127b1b66000a6c500caa2b085bc0ca976c"
+                "sha256:514f76d918fcc0b55c6680472f0a37970994e07bbb80725808c17089be302068",
+                "sha256:c389c1d06bf7904078ca03399a4816f974a1d590090fecea0c63ec26ebaf1cef"
             ],
-            "version": "==2.5.0"
+            "version": "==2.7.0"
         },
         "pydocstyle": {
             "hashes": [
-                "sha256:da7831660b7355307b32778c4a0dbfb137d89254ef31a2b2978f50fc0b4d7586",
-                "sha256:f4f5d210610c2d153fae39093d44224c17429e2ad7da12a8b419aba5c2f614b5"
+                "sha256:164befb520d851dbcf0e029681b91f4f599c62c5cd8933fd54b1bfbd50e89e1f",
+                "sha256:d4449cf16d7e6709f63192146706933c7a334af7c0f083904799ccb851c50f6d"
             ],
-            "version": "==5.0.2"
+            "version": "==6.0.0"
         },
         "pyflakes": {
             "hashes": [
-                "sha256:17dbeb2e3f4d772725c777fabc446d5634d1038f234e77343108ce445ea69ce0",
-                "sha256:d976835886f8c5b31d47970ed689944a0262b5f3afa00a5a7b4dc81e5449f8a2"
+                "sha256:7893783d01b8a89811dd72d7dfd4d84ff098e5eed95cfa8905b22bbffe52efc3",
+                "sha256:f5bc8ecabc05bb9d291eb5203d6810b49040f6ff446a756326104746cc00c1db"
             ],
-            "version": "==2.1.1"
+            "version": "==2.3.1"
         },
         "pylama": {
             "hashes": [
@@ -231,10 +254,10 @@
         },
         "pyparsing": {
             "hashes": [
-                "sha256:4c830582a84fb022400b85429791bc551f1f4871c33f23e44f353119e92f969f",
-                "sha256:c342dccb5250c08d45fd6f8b4a559613ca603b57498511740e65cd11a2e7dcec"
+                "sha256:1c6409312ce2ce2997896af5756753778d5f1603666dba5587804f09ad82ed27",
+                "sha256:f4896b4cc085a1f8f8ae53a1a90db5a86b3825ff73eb974dffee3d9e701007f4"
             ],
-            "version": "==2.4.6"
+            "version": "==3.0.0b2"
         },
         "pytest": {
             "hashes": [
@@ -254,59 +277,90 @@
         },
         "pyyaml": {
             "hashes": [
-                "sha256:06a0d7ba600ce0b2d2fe2e78453a470b5a6e000a985dd4a4e54e436cc36b0e97",
-                "sha256:240097ff019d7c70a4922b6869d8a86407758333f02203e0fc6ff79c5dcede76",
-                "sha256:4f4b913ca1a7319b33cfb1369e91e50354d6f07a135f3b901aca02aa95940bd2",
-                "sha256:69f00dca373f240f842b2931fb2c7e14ddbacd1397d57157a9b005a6a9942648",
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@@ -318,58 +372,67 @@
         },
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         "wcwidth": {
             "hashes": [
-                "sha256:cafe2186b3c009a04067022ce1dcd79cb38d8d65ee4f4791b8888d6599d1bbe1",
-                "sha256:ee73862862a156bf77ff92b09034fc4825dd3af9cf81bc5b360668d425f3c5f1"
+                "sha256:beb4802a9cebb9144e99086eff703a642a13d6a0052920003a230f3294bbe784",
+                "sha256:c4d647b99872929fdb7bdcaa4fbe7f01413ed3d98077df798530e5b04f116c83"
             ],
-            "version": "==0.1.9"
+            "version": "==0.2.5"
         },
         "yamllint": {
             "hashes": [