diff --git a/Pipfile.lock b/Pipfile.lock
index 5b5470e..d1fc4bb 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -19,7 +19,6 @@
                 "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1",
                 "sha256:ef6aaac3ca6cd92904cdd0d83f629a15f18053ec84e6432106f7a4d04ae4f5fb"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
             "version": "==21.2.0"
         },
         "cachetools": {
@@ -27,22 +26,20 @@
                 "sha256:2cc0b89715337ab6dbba85b5b50effe2b0c74e035d83ee8ed637cf52f12ae001",
                 "sha256:61b5ed1e22a0924aed1d23b478f37e8d52549ff8a961de2909c69bf950020cff"
             ],
-            "markers": "python_version ~= '3.5'",
             "version": "==4.2.2"
         },
         "certifi": {
             "hashes": [
-                "sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c",
-                "sha256:719a74fb9e33b9bd44cc7f3a8d94bc35e4049deebe19ba7d8e108280cfd59830"
+                "sha256:2bbf76fd432960138b3ef6dda3dde0544f27cbf8546c458e60baf371917ba9ee",
+                "sha256:50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8"
             ],
-            "version": "==2020.12.5"
+            "version": "==2021.5.30"
         },
         "chardet": {
             "hashes": [
                 "sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa",
                 "sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
             "version": "==4.0.0"
         },
         "coverage": {
@@ -108,23 +105,20 @@
                 "sha256:f612ee47b749c877ebae5bb77035d8f4202c6ad0f0fc1271b3c18ad6c4468ecf",
                 "sha256:f95f8dedd925fd8f54edb3d2dfb44c190d9d18512377d3c1e2388d16126879bc"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==1.1.0"
         },
         "cssutils": {
             "hashes": [
-                "sha256:5bef59f6b59bdccbea8e36cb292d2be1b6be1b485fc4a9f5886616f19eb31aaf",
-                "sha256:c76b08ac9ab92d258947dd74ca439c9bed8db8fbf3e1bfced7043abcfeeb0843"
+                "sha256:0cf1f6086b020dee18048ff3999339499f725934017ef9ae2cd5bb77f9ab5f46",
+                "sha256:b2d3b16047caae82e5c590036935bafa1b621cf45c2f38885af4be4838f0fd00"
             ],
-            "markers": "python_version >= '3.6'",
-            "version": "==2.2.0"
+            "version": "==2.3.0"
         },
         "dataproperty": {
             "hashes": [
                 "sha256:7419a25b4f9b3326dc24ca7faf6826aed0993b1cb4d6bedccbfc7a5d3a92aa86",
                 "sha256:cad9080e5d1bac85a3bd33a016743537370d524ae683b012345ed9b5b7715f6b"
             ],
-            "markers": "python_version >= '3.5'",
             "version": "==0.50.1"
         },
         "idna": {
@@ -132,7 +126,6 @@
                 "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6",
                 "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
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-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.10"
         },
         "iniconfig": {
@@ -191,7 +184,6 @@
                 "sha256:f8380c03e45cf09f8557bdaa41e1fa7c81f3ae22828e1db470ab2a6c96d8bc23",
                 "sha256:f90ba11136bfdd25cae3951af8da2e95121c9b9b93727b1b896e3fa105b2f586"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
             "version": "==4.6.3"
         },
         "mbstrdecoder": {
@@ -199,7 +191,6 @@
                 "sha256:56b967800d6554815a6b18f98f915e84912852eff21d94d5e036fe124bc27f53",
                 "sha256:f895e1fb97496855ab5e43de99588787169c01f782c71625142d1a62729e9f9d"
             ],
-            "markers": "python_version >= '3.5'",
             "version": "==1.0.1"
         },
         "msgfy": {
@@ -207,45 +198,44 @@
                 "sha256:474c08302cd56ccee1300ac7976a01ebd1e42716fc9bcd947d39a311a15b7012",
                 "sha256:ce8a8c8c223279fa0a2c0f278eec139fcf761ca4eb98f179f54a1b96f53514f5"
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-            "markers": "python_version >= '3.5'",
             "version": "==0.1.0"
         },
         "numpy": {
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-                "sha256:4e465afc3b96dbc80cf4a5273e5e2b1e3451286361b4af70ce1adb2984d392f9",
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-                "sha256:a9c65473ebc342715cb2d7926ff1e202c26376c0dcaaee85a1fd4b8d8c1d3b2f",
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-                "sha256:e55185e51b18d788e49fe8305fd73ef4470596b33fc2c1ceb304566b99c71a69",
-                "sha256:ea9cff01e75a956dbee133fa8e5b68f2f92175233de2f88de3a682dd94deda65",
-                "sha256:f1452578d0516283c87608a5a5548b0cdde15b99650efdfd85182102ef7a7c17",
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-            "markers": "python_version >= '3.7'",
-            "version": "==1.20.3"
+                "sha256:068cfc78963ce8b9dd2dc7ad1f2d5ebebc47e10103ea0166074e6bd31e78aeb8",
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+                "sha256:63b3d66f5610c61d3d1b47687b99584fdf7734192344814d80f2670e0c7b05ef",
+                "sha256:6ed13704d67934d458abeaacd96079bb8ae5f0ea000765777449e94288590097",
+                "sha256:723fff54844d9c1e01703ed2bc177f892fd89530b7671e8191a639d799cd75b7",
+                "sha256:7ada705e3e9364f874c41fc370c23247f4c1466888dfd61ac5ec9277524928c2",
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+                "sha256:8b92d27414779f568484c4a0aeddbff8e1fa9d9403cff122161fa25bc94e7f44",
+                "sha256:97faf00577c74a4f4b6304c1b7f6223fb0825d1a7cfaad5601cbeadd8282cd70",
+                "sha256:9abfe8ef4f8898d0448de735a3270de466553b61de8e6ddc31fc8770003fdfa4",
+                "sha256:a1c3737f659085eeaab83e016569368157d8d46d6a3be317c864dadd3c28fa42",
+                "sha256:a3a480ac4077c868124427456c6a64dcb7da12817bd3e770006980a4fd0d2526",
+                "sha256:b58c8c1ea4b80a5cbc756a11e446eec16088ebd9e080e71a64c458f6c07cb3c7",
+                "sha256:da0797286c299c426e5b6cf03ca9e1dab0dace161b64d7a1879c4d15eb12ceba",
+                "sha256:dcc194082d94c45fe8a005861cdce6ec33b51c1dccf2a7e6044b33038b82f579",
+                "sha256:f5e7cd7068df4aa803be68edc7c6fc5e3ed934d53a7ab1f21539fb5925e0172e",
+                "sha256:ff442e4fe6e66019b2070352e0cd6e7dde994ff1267d45343b587ed621e4ec47"
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+            "version": "==1.21.0rc1"
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         "packaging": {
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                 "sha256:67714da7f7bc052e064859c05c595155bd1ee9f69f76557e21f051443c20947a"
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-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==20.9"
         },
         "pandas": {
@@ -275,38 +265,35 @@
                 "sha256:3c9bd94c7ec23e9cfb211ffbe356ae75f979d6c099a2c745ee9490f524f32468",
                 "sha256:f5dde7efeeb4262784c5e1331e02752d07c1ec3ee5ea42683fe211155652b808"
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-            "markers": "python_version >= '3.5'",
             "version": "==2.4.1"
         },
         "pluggy": {
             "hashes": [
-                "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
-                "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"
+                "sha256:265a94bf44ca13662f12fcd1b074c14d4b269a712f051b6f644ef7e705d6735f",
+                "sha256:467f0219e89bb5061a8429c6fc5cf055fa3983a0e68e84a1d205046306b37d9e"
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-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==0.13.1"
+            "version": "==1.0.0.dev0"
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         "premailer": {
             "hashes": [
-                "sha256:4d4e157244cee945a00c14feaa9e6a3aeb2faf2623ff6a8ba08afdf505fa0f25"
+                "sha256:d674826981be58d2eaa51db25f31bfe02f2859760aa1ff9879de9110f48e6476",
+                "sha256:da18b9e8cb908893b67ab9b7451276fef7c0ab179f40189378545f6bb0ab3695"
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-            "version": "==3.8.0"
+            "version": "==3.9.0"
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         "py": {
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                 "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
                 "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
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-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==1.10.0"
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         "pyparsing": {
             "hashes": [
-                "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1",
-                "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"
+                "sha256:1c6409312ce2ce2997896af5756753778d5f1603666dba5587804f09ad82ed27",
+                "sha256:f4896b4cc085a1f8f8ae53a1a90db5a86b3825ff73eb974dffee3d9e701007f4"
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-            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==2.4.7"
+            "version": "==3.0.0b2"
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         "pytablewriter": {
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@@ -351,7 +338,6 @@
                 "sha256:27973dd4a904a4f13b263a19c866c13b92a39ed1c964655f025f3f8d3d75b804",
                 "sha256:c210084e36a42ae6b9219e00e48287def368a26d03a048ddad7bfee44f75871e"
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             "version": "==2.25.1"
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         "six": {
@@ -367,7 +353,6 @@
                 "sha256:76984fd93d9cb05258a03941ecd9d95d549379b35294b3dfc21c844ed06a67b2",
                 "sha256:c0902a7f90130b362a6e29b2faaca09bc468efec0f53e8b01a3e5ab607554ea9"
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-            "markers": "python_version >= '3.5'",
             "version": "==1.1.4"
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         "tcolorpy": {
@@ -375,7 +360,6 @@
                 "sha256:565d396d7102cf1b381a883896fd24057b25a02146884ab22ead3fcf521ecbcf",
                 "sha256:642d4105c59e6fac6c1a2e04962a8a4c363cb7070f956969c4af5e2a780b5ef3"
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-            "markers": "python_version >= '3.5'",
             "version": "==0.0.9"
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         "toml": {
@@ -383,7 +367,6 @@
                 "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b",
                 "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"
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-            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==0.10.2"
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         "typepy": {
@@ -394,16 +377,15 @@
                 "sha256:1bbe790bb8d1b43b4541b235678974d5aee2357e1948cdf17cb4c14cbe4a2a82",
                 "sha256:bfcdded5466e47eb14716328d4da1887a599cf2dcb1a560f63da7abdda361f7d"
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-            "markers": "python_version >= '3.5'",
             "version": "==1.1.5"
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         "urllib3": {
             "hashes": [
-                "sha256:2f4da4594db7e1e110a944bb1b551fdf4e6c136ad42e4234131391e21eb5b0df",
-                "sha256:e7b021f7241115872f92f43c6508082facffbd1c048e3c6e2bb9c2a157e28937"
+                "sha256:753a0374df26658f99d826cfe40394a686d05985786d946fbe4165b5148f5a7c",
+                "sha256:a7acd0977125325f516bda9735fa7142b909a8d01e8b2e4c8108d0984e6e0098"
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-            "version": "==1.26.4"
+            "index": "pypi",
+            "version": "==1.26.5"
         },
         "wheel": {
             "hashes": [
@@ -432,18 +414,16 @@
         },
         "astroid": {
             "hashes": [
-                "sha256:4db03ab5fc3340cf619dbc25e42c2cc3755154ce6009469766d7143d1fc2ee4e",
-                "sha256:8a398dfce302c13f14bab13e2b14fe385d32b73f4e4853b9bdfb64598baa1975"
+                "sha256:3c9a2d84354185d13213ff2640ec03d39168dbcd13648abc84fb13ca3b2e2761",
+                "sha256:d66a600e1602736a0f24f725a511b0e50d12eb18f54b31ec276d2c26a0a62c6a"
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-            "markers": "python_version ~= '3.6'",
-            "version": "==2.5.6"
+            "version": "==2.5.7"
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         "attrs": {
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                 "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1",
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             "version": "==21.2.0"
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         "black": {
@@ -459,7 +439,6 @@
                 "sha256:8c04c11192119b1ef78ea049e0a6f0463e4c48ef00a30160c704337586f3ad7a",
                 "sha256:fba402a4a47334742d782209a7c79bc448911afe1149d07bdabdf480b3e2f4b6"
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             "version": "==8.0.1"
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         "flake8": {
@@ -482,7 +461,6 @@
                 "sha256:0a943902919f65c5684ac4e0154b1ad4fac6dcaa5d9f3426b732f1c8b5419be6",
                 "sha256:2bb1680aad211e3c9944dbce1d4ba09a989f04e238296c87fe2139faa26d655d"
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             "version": "==5.8.0"
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         "lazy-object-proxy": {
@@ -510,7 +488,6 @@
                 "sha256:ed361bb83436f117f9917d282a456f9e5009ea12fd6de8742d1a4752c3017e93",
                 "sha256:f5144c75445ae3ca2057faac03fda5a902eff196702b0a24daf1d6ce0650514b"
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-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'",
             "version": "==1.6.0"
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         "mccabe": {
@@ -532,7 +509,6 @@
                 "sha256:5b327ac1320dc863dca72f4514ecc086f31186744b84a230374cc1fd776feae5",
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             "version": "==20.9"
         },
         "pathspec": {
@@ -544,18 +520,16 @@
         },
         "pluggy": {
             "hashes": [
-                "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
-                "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"
+                "sha256:265a94bf44ca13662f12fcd1b074c14d4b269a712f051b6f644ef7e705d6735f",
+                "sha256:467f0219e89bb5061a8429c6fc5cf055fa3983a0e68e84a1d205046306b37d9e"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==0.13.1"
+            "version": "==1.0.0.dev0"
         },
         "py": {
             "hashes": [
                 "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
                 "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==1.10.0"
         },
         "pycodestyle": {
@@ -563,7 +537,6 @@
                 "sha256:514f76d918fcc0b55c6680472f0a37970994e07bbb80725808c17089be302068",
                 "sha256:c389c1d06bf7904078ca03399a4816f974a1d590090fecea0c63ec26ebaf1cef"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.7.0"
         },
         "pyflakes": {
@@ -571,7 +544,6 @@
                 "sha256:7893783d01b8a89811dd72d7dfd4d84ff098e5eed95cfa8905b22bbffe52efc3",
                 "sha256:f5bc8ecabc05bb9d291eb5203d6810b49040f6ff446a756326104746cc00c1db"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.3.1"
         },
         "pylint": {
@@ -584,11 +556,10 @@
         },
         "pyparsing": {
             "hashes": [
-                "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1",
-                "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"
+                "sha256:1c6409312ce2ce2997896af5756753778d5f1603666dba5587804f09ad82ed27",
+                "sha256:f4896b4cc085a1f8f8ae53a1a90db5a86b3825ff73eb974dffee3d9e701007f4"
             ],
-            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==2.4.7"
+            "version": "==3.0.0b2"
         },
         "pytest": {
             "hashes": [
@@ -649,7 +620,6 @@
                 "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b",
                 "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"
             ],
-            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==0.10.2"
         },
         "wrapt": {