diff --git a/Pipfile b/Pipfile
index 8e20b8db..afe98580 100644
--- a/Pipfile
+++ b/Pipfile
@@ -7,20 +7,20 @@ name = "pypi"
 
 [packages]
 
-cython = "==0.28.5"
-pydocstyle = "==2.1.1"
-pylint = "==2.1.1"
+cython = "==0.29.2"
+pydocstyle = "==3.0.0"
+pylint = "==2.2.2"
 mypy-lang = "==0.5.0"
-coverage = "==4.5.1"
-pytest = "==3.7.4"
-pytest-pylint = "==0.12.3"
+coverage = "==4.5.2"
+pytest = "==4.0.2"
+pytest-pylint = "==0.13.0"
 pytest-mypy = "==0.3.2"
-pytest-cov = "==2.5.1"
+pytest-cov = "==2.6.0"
 pytest-runner = "==4.2"
-coveralls = "==1.5.0"
+coveralls = "==1.5.1"
 
 
 [dev-packages]
 
-sphinx = "==1.7.8"
+sphinx = "==1.8.3"
 ghp-import = "==0.5.5"
diff --git a/Pipfile.lock b/Pipfile.lock
index 1150ade1..e762f301 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -29,17 +29,17 @@
     "default": {
         "astroid": {
             "hashes": [
-                "sha256:292fa429e69d60e4161e7612cb7cc8fa3609e2e309f80c224d93a76d5e7b58be",
-                "sha256:c7013d119ec95eb626f7a2011f0b63d0c9a095df9ad06d8507b37084eada1a8d"
+                "sha256:6a5d668d7dc69110de01cdf7aeec69a679ef486862a0850cc0fd5571505b6b7e",
+                "sha256:35b032003d6a863f5dcd7ec11abd5cd5893428beaa31ab164982403bcb311f22"
             ],
-            "version": "==2.0.4"
+            "version": "==2.1.0"
         },
         "certifi": {
             "hashes": [
-                "sha256:456048c7e371c089d0a77a5212fb37a2c2dce1e24146e3b7e0261736aaeaa22a",
-                "sha256:376690d6f16d32f9d1fe8932551d80b23e9d393a8578c5633a2ed39a64861638"
+                "sha256:993f830721089fef441cdfeb4b2c8c9df86f0c63239f06bd025a76a7daddb033",
+                "sha256:47f9c83ef4c0c621eaef743f133f09fa8a74a9b75f037e8624f83bd1b6626cb7"
             ],
-            "version": "==2018.8.24"
+            "version": "==2018.11.29"
         },
         "chardet": {
             "hashes": [
@@ -50,84 +50,89 @@
         },
         "coverage": {
             "hashes": [
-                "sha256:7608a3dd5d73cb06c531b8925e0ef8d3de31fed2544a7de6c63960a1e73ea4bc",
-                "sha256:3a2184c6d797a125dca8367878d3b9a178b6fdd05fdc2d35d758c3006a1cd694",
-                "sha256:f3f501f345f24383c0000395b26b726e46758b71393267aeae0bd36f8b3ade80",
-                "sha256:0b136648de27201056c1869a6c0d4e23f464750fd9a9ba9750b8336a244429ed",
-                "sha256:337ded681dd2ef9ca04ef5d93cfc87e52e09db2594c296b4a0a3662cb1b41249",
-                "sha256:3eb42bf89a6be7deb64116dd1cc4b08171734d721e7a7e57ad64cc4ef29ed2f1",
-                "sha256:be6cfcd8053d13f5f5eeb284aa8a814220c3da1b0078fa859011c7fffd86dab9",
-                "sha256:69bf008a06b76619d3c3f3b1983f5145c75a305a0fea513aca094cae5c40a8f5",
-                "sha256:2eb564bbf7816a9d68dd3369a510be3327f1c618d2357fa6b1216994c2e3d508",
-                "sha256:9d6dd10d49e01571bf6e147d3b505141ffc093a06756c60b053a859cb2128b1f",
-                "sha256:701cd6093d63e6b8ad7009d8a92425428bc4d6e7ab8d75efbb665c806c1d79ba",
-                "sha256:5a13ea7911ff5e1796b6d5e4fbbf6952381a611209b736d48e675c2756f3f74e",
-                "sha256:c1bb572fab8208c400adaf06a8133ac0712179a334c09224fb11393e920abcdd",
-                "sha256:03481e81d558d30d230bc12999e3edffe392d244349a90f4ef9b88425fac74ba",
-                "sha256:28b2191e7283f4f3568962e373b47ef7f0392993bb6660d079c62bd50fe9d162",
-                "sha256:de4418dadaa1c01d497e539210cb6baa015965526ff5afc078c57ca69160108d",
-                "sha256:8c3cb8c35ec4d9506979b4cf90ee9918bc2e49f84189d9bf5c36c0c1119c6558",
-                "sha256:7e1fe19bd6dce69d9fd159d8e4a80a8f52101380d5d3a4d374b6d3eae0e5de9c",
-                "sha256:6bc583dc18d5979dc0f6cec26a8603129de0304d5ae1f17e57a12834e7235062",
-                "sha256:198626739a79b09fa0a2f06e083ffd12eb55449b5f8bfdbeed1df4910b2ca640",
-                "sha256:7aa36d2b844a3e4a4b356708d79fd2c260281a7390d678a10b91ca595ddc9e99",
-                "sha256:3d72c20bd105022d29b14a7d628462ebdc61de2f303322c0212a054352f3b287",
-                "sha256:4635a184d0bbe537aa185a34193898eee409332a8ccb27eea36f262566585000",
-                "sha256:e05cb4d9aad6233d67e0541caa7e511fa4047ed7750ec2510d466e806e0255d6",
-                "sha256:76ecd006d1d8f739430ec50cc872889af1f9c1b6b8f48e29941814b09b0fd3cc",
-                "sha256:7d3f553904b0c5c016d1dad058a7554c7ac4c91a789fca496e7d8347ad040653",
-                "sha256:3c79a6f7b95751cdebcd9037e4d06f8d5a9b60e4ed0cd231342aa8ad7124882a",
-                "sha256:56e448f051a201c5ebbaa86a5efd0ca90d327204d8b059ab25ad0f35fbfd79f1",
-                "sha256:ac4fef68da01116a5c117eba4dd46f2e06847a497de5ed1d64bb99a5fda1ef91",
-                "sha256:1c383d2ef13ade2acc636556fd544dba6e14fa30755f26812f54300e401f98f2",
-                "sha256:b8815995e050764c8610dbc82641807d196927c3dbed207f0a079833ffcf588d",
-                "sha256:104ab3934abaf5be871a583541e8829d6c19ce7bde2923b2751e0d3ca44db60a",
-                "sha256:9e112fcbe0148a6fa4f0a02e8d58e94470fc6cb82a5481618fea901699bf34c4",
-                "sha256:15b111b6a0f46ee1a485414a52a7ad1d703bdf984e9ed3c288a4414d3871dcbd",
-                "sha256:e4d96c07229f58cb686120f168276e434660e4358cc9cf3b0464210b04913e77",
-                "sha256:f8a923a85cb099422ad5a2e345fe877bbc89a8a8b23235824a93488150e45f6e"
-            ],
-            "version": "==4.5.1"
+                "sha256:a5c58664b23b248b16b96253880b2868fb34358911400a7ba39d7f6399935389",
+                "sha256:b3b0c8f660fae65eac74fbf003f3103769b90012ae7a460863010539bb7a80da",
+                "sha256:8cb4febad0f0b26c6f62e1628f2053954ad2c555d67660f28dfb1b0496711952",
+                "sha256:447c450a093766744ab53bf1e7063ec82866f27bcb4f4c907da25ad293bba7e3",
+                "sha256:1b4276550b86caa60606bd3572b52769860a81a70754a54acc8ba789ce74d607",
+                "sha256:6694d5573e7790a0e8d3d177d7a416ca5f5c150742ee703f3c18df76260de794",
+                "sha256:510986f9a280cd05189b42eee2b69fecdf5bf9651d4cd315ea21d24a964a3c36",
+                "sha256:09e47c529ff77bf042ecfe858fb55c3e3eb97aac2c87f0349ab5a7efd6b3939f",
+                "sha256:5535dda5739257effef56e49a1c51c71f1d37a6e5607bb25a5eee507c59580d1",
+                "sha256:0a1f9b0eb3aa15c990c328535655847b3420231af299386cfe5efc98f9c250fe",
+                "sha256:0cc941b37b8c2ececfed341444a456912e740ecf515d560de58b9a76562d966d",
+                "sha256:da969da069a82bbb5300b59161d8d7c8d423bc4ccd3b410a9b4d8932aeefc14b",
+                "sha256:6831e1ac20ac52634da606b658b0b2712d26984999c9d93f0c6e59fe62ca741b",
+                "sha256:5f55028169ef85e1fa8e4b8b1b91c0b3b0fa3297c4fb22990d46ff01d22c2d6c",
+                "sha256:10e8af18d1315de936d67775d3a814cc81d0747a1a0312d84e27ae5610e313b0",
+                "sha256:2b224052bfd801beb7478b03e8a66f3f25ea56ea488922e98903914ac9ac930b",
+                "sha256:77f0d9fa5e10d03aa4528436e33423bfa3718b86c646615f04616294c935f840",
+                "sha256:5a7524042014642b39b1fcae85fb37556c200e64ec90824ae9ecf7b667ccfc14",
+                "sha256:85a06c61598b14b015d4df233d249cd5abfa61084ef5b9f64a48e997fd829a82",
+                "sha256:ed02c7539705696ecb7dc9d476d861f3904a8d2b7e894bd418994920935d36bb",
+                "sha256:aaa0f296e503cda4bc07566f592cd7a28779d433f3a23c48082af425d6d5a78f",
+                "sha256:1e8a2627c48266c7b813975335cfdea58c706fe36f607c97d9392e61502dc79d",
+                "sha256:46101fc20c6f6568561cdd15a54018bb42980954b79aa46da8ae6f008066a30e",
+                "sha256:ee5b8abc35b549012e03a7b1e86c09491457dba6c94112a2482b18589cc2bdb9",
+                "sha256:c45297bbdbc8bb79b02cf41417d63352b70bcb76f1bbb1ee7d47b3e89e42f95d",
+                "sha256:d64b4340a0c488a9e79b66ec9f9d77d02b99b772c8b8afd46c1294c1d39ca478",
+                "sha256:828ad813c7cdc2e71dcf141912c685bfe4b548c0e6d9540db6418b807c345ddd",
+                "sha256:d19bca47c8a01b92640c614a9147b081a1974f69168ecd494687c827109e8f42",
+                "sha256:4710dc676bb4b779c4361b54eb308bc84d64a2fa3d78e5f7228921eccce5d815",
+                "sha256:bab8e6d510d2ea0f1d14f12642e3f35cefa47a9b2e4c7cea1852b52bc9c49647",
+                "sha256:ab235d9fe64833f12d1334d29b558aacedfbca2356dfb9691f2d0d38a8a7bfb4",
+                "sha256:99bd767c49c775b79fdcd2eabff405f1063d9d959039c0bdd720527a7738748a",
+                "sha256:71afc1f5cd72ab97330126b566bbf4e8661aab7449f08895d21a5d08c6b051ff",
+                "sha256:06123b58a1410873e22134ca2d88bd36680479fe354955b3579fb8ff150e4d27",
+                "sha256:7349c27128334f787ae63ab49d90bf6d47c7288c63a0a5dfaa319d4b4541dd2c",
+                "sha256:869ef4a19f6e4c6987e18b315721b8b971f7048e6eaea29c066854242b4e98d9",
+                "sha256:859714036274a75e6e57c7bab0c47a4602d2a8cfaaa33bbdb68c8359b2ed4f5c",
+                "sha256:0d34245f824cc3140150ab7848d08b7e2ba67ada959d77619c986f2062e1f0e8",
+                "sha256:977e2d9a646773cc7428cdd9a34b069d6ee254fadfb4d09b3f430e95472f3cf3",
+                "sha256:3ad59c84c502cd134b0088ca9038d100e8fb5081bbd5ccca4863f3804d81f61d",
+                "sha256:258b21c5cafb0c3768861a6df3ab0cfb4d8b495eee5ec660e16f928bf7385390"
+            ],
+            "version": "==4.5.2"
         },
         "coveralls": {
             "hashes": [
-                "sha256:aec5a1f5e34224b9089664a1b62217732381c7de361b6ed1b3c394d7187b352a",
-                "sha256:9dee67e78ec17b36c52b778247762851c8e19a893c9a14e921a2fc37f05fac22"
+                "sha256:b2388747e2529fa4c669fb1e3e2756e4e07b6ee56c7d9fce05f35ccccc913aa0",
+                "sha256:ab638e88d38916a6cedbf80a9cd8992d5fa55c77ab755e262e00b36792b7cd6d"
             ],
-            "version": "==1.5.0"
+            "version": "==1.5.1"
         },
         "cython": {
             "hashes": [
-                "sha256:13c73e2ffa93a615851e03fad97591954d143b5b62361b9adef81f46a31cd8ef",
-                "sha256:9ec27681c5b1b457aacb1cbda5db04aa28b76da2af6e1e1fd15f233eafe6a0b0",
-                "sha256:13eab5a2835a84ff62db343035603044c908d2b3b6eec09d67fdf9970acf7ac9",
-                "sha256:022592d419fc754509d0e0461eb2958dbaa45fb60d51c8a61778c58994edbe36",
-                "sha256:ae4784f040a3313c8bd00c8d04934b7ade63dc59692d8f00a5235be8ed72a445",
-                "sha256:e22f21cf92a9f8f007a280e3b3462c886d9068132a6c698dec10ad6125e3ca1e",
-                "sha256:b2ba8310ebd3c0e0b884d5e95bbd99d467d6af922acd1e44fe4b819839b2150e",
-                "sha256:ef86de9299e4ab2ebb129fb84b886bf40b9aced9807c6d6d5f28b46fb905f82c",
-                "sha256:183b35a48f58862c4ec1e821f07bb7b1156c8c8559c85c32ae086f28947474eb",
-                "sha256:693a8619ef066ece055ed065a15cf440f9d3ebd1bca60e87ea19144833756433",
-                "sha256:87e57b5d730cfab225d95e7b23abbc0c6f77598bd66639e93c73ce8afbae6f38",
-                "sha256:07659f4c57582104d9486c071de512fbd7e087a3a630535298442cc0e20a3f5a",
-                "sha256:cdbb917e41220bd3812234dbe59d15391adbc2c5d91ae11a5273aab9e32ba7ec",
-                "sha256:32de8637f5e6c5a76667bc7c8fc644bd9314dc19af36db8ce30a0b92ada0f642",
-                "sha256:660eeb6870687fd3eda91e00ba4e72220545c254c8c4d967fd0c910f4fbb8cbc",
-                "sha256:9400e5db8383346b0694a3e794d8bded18a27b21123516dcdf4b79d7ec28e98b",
-                "sha256:ee7a9614d51fe16e32ca5befe72e0808baff481791728449d0b17c8b0fe29eb9",
-                "sha256:827d3a91b7a7c31ce69e5974496fd9a8ba28eb498b988affb66d0d30de11d934",
-                "sha256:ea5c16c48e561f4a6f6b8c24807494b77a79e156b8133521c400f22ca712101b",
-                "sha256:4172c183ef4fb2ace6a29cdf7fc9200c5a471a7f775ff691975b774bd9ed3ad2",
-                "sha256:c78ad0df75a9fc03ab28ca1b950c893a208c451a18f76796c3e25817d6994001",
-                "sha256:d2223a80c623e2a8e97953ab945dfaa9385750a494438dcb55562eb1ddd9565a",
-                "sha256:553956ec06ecbd731ef0c538eb28a5b46bedea7ab89b18237ff28b4b99d65eee",
-                "sha256:2f526b0887128bf20ab2acc905a975f62b5a04ab2f63ecbe5a30fc28285d0e0c",
-                "sha256:f3e4860f5458a9875caa3de65e255720c0ed2ce71f0bcdab02497b32104f9db8",
-                "sha256:759c799e9ef418f163b5412e295e14c0a48fe3b4dcba9ab8aab69e9f511cfefd",
-                "sha256:fc6c20a8ac22202a779ad4c59756647be0826993d2151a03c015e76d2368ae5f",
-                "sha256:b64575241f64f6ec005a4d4137339fb0ba5e156e826db2fdb5f458060d9979e0"
-            ],
-            "version": "==0.28.5"
+                "sha256:a6581d3dda15adea19ac70b89211aadbf21f45c7f3ee3bc8e1536e5437c9faf9",
+                "sha256:cdfb68eb11c6c4e90e34cf54ffd678a7813782fae980d648db6185e6b0c8a0ba",
+                "sha256:ca7daccffb14896767b20d69bfc8de9e41e9589b9377110292c3af8460ef9c2b",
+                "sha256:9e60b83afe8914ab6607f7150fd282d1cb0531a45cf98d2a40159f976ae4cd7a",
+                "sha256:382c1e0f8f8be36e9057264677fd60b669a41c5810113694cbbb4060ee0cefc0",
+                "sha256:085d596c016130f5b1e2fe72446e3e63bfcf67535e7ff6772eaa05c5d2ad6fd5",
+                "sha256:e8420326e4b40bcbb06f070efb218ca2ca21827891b7c69d4cc4802b3ce1afc9",
+                "sha256:12c007d3704ca9840734748fd6c052960be67562ff15609c3b85d1ca638289d2",
+                "sha256:3669dfe4117ee8825a48cf527cb4ac15a39a0142fcb72ecedfd75fe6545b2cda",
+                "sha256:bc524cc603f0aa23af00111ddd1aa0aad12d629f5a9a5207f425a1af66393094",
+                "sha256:6f1a5344ff1f0f44023c41d4b0e52215b490658b42e017520cb89a56250ecbca",
+                "sha256:af515924b8aebb729f631590eb43300ce948fa67d3885fdae9238717c0a68821",
+                "sha256:e7f71b489959d478cff72d8dcab1531efd43299341e3f8b85ab980beec452ded",
+                "sha256:998af90092cd1231990eb878e2c71ed92716d6a758aa03a2e6673e077a7dd072",
+                "sha256:7a29f9d780ac497dcd76ce814a9d170575bedddeb89ecc25fe738abef4c87172",
+                "sha256:3585fbe18d8666d91ecb3b3366ca6e9ea49001cd0a7c38a226cececb7852aa0d",
+                "sha256:eec1b890cf5c16cb656a7062769ac276c0fccf898ce215ff8ef75eac740063f7",
+                "sha256:44bb606d8c60d8acaa7f72b3bbc2ebd9816785124c58d33c057ca326f1185dae",
+                "sha256:1014758344717844a05882c92ebd76d8fab15b0a8e9b42b378a99a6c5299ab3b",
+                "sha256:1b6f201228368ec9b307261b46512f3605f84d4994bb6eb78cdab71455810424",
+                "sha256:e17104c6871e7c0eee4de12717892a1083bd3b8b1da0ec103fa464b1c6c80964",
+                "sha256:b49ea3bb357bc34eaa7b461633ce7c2d79186fe681297115ff9e2b8f5ceba2fd",
+                "sha256:d21fb6e7a3831f1f8346275839d46ed1eb2abd350fc81bad2fdf208cc9e4f998",
+                "sha256:1a20f575197e814453f2814829715fcb21436075e298d883a34c7ffe4d567a1d",
+                "sha256:004c181b75f926f48dc0570372ca2cfb06a1b3210cb647185977ce9fde98b66e",
+                "sha256:8022a5b83ef442584f2efd941fe8678de1c67e28bf81e6671b20627ec8a79387",
+                "sha256:f04e21ba7c117b20f57b0af2d4c8ed760495e5bb3f21b0352dbcfe5d2221678b",
+                "sha256:2ac187ff998a95abb7fae452b5178f91e1a713698c9ced89836c94e6b1d3f41e"
+            ],
+            "version": "==0.29.2"
         },
         "docopt": {
             "hashes": [
@@ -137,10 +142,10 @@
         },
         "idna": {
             "hashes": [
-                "sha256:156a6814fb5ac1fc6850fb002e0852d56c0c8d2531923a51032d1b70760e186e",
-                "sha256:684a38a6f903c1d71d6d5fac066b58d7768af4de2b832e426ec79c30daa94a16"
+                "sha256:ea8b7f6188e6fa117537c3df7da9fc686d485087abf6ac197f9c46432f7e4a3c",
+                "sha256:c357b3f628cf53ae2c4c05627ecc484553142ca23264e593d327bcde5e9c3407"
             ],
-            "version": "==2.7"
+            "version": "==2.8"
         },
         "isort": {
             "hashes": [
@@ -193,10 +198,10 @@
         },
         "mypy": {
             "hashes": [
-                "sha256:673ea75fb750289b7d1da1331c125dc62fc1c3a8db9129bb372ae7b7d5bf300a",
-                "sha256:c770605a579fdd4a014e9f0a34b6c7a36ce69b08100ff728e96e27445cef3b3c"
+                "sha256:12d965c9c4e8a625673aec493162cf390e66de12ef176b1f4821ac00d55f3ab3",
+                "sha256:38d5b5f835a81817dcc0af8d155bce4e9aefa03794fe32ed154d6612e83feafa"
             ],
-            "version": "==0.620"
+            "version": "==0.650"
         },
         "mypy-lang": {
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@@ -206,53 +211,53 @@
         },
         "psutil": {
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-            "version": "==3.7.4"
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@@ -263,11 +268,11 @@
         },
         "pytest-pylint": {
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@@ -278,17 +283,17 @@
         },
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@@ -299,33 +304,36 @@
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@@ -337,10 +345,10 @@
     "develop": {
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@@ -351,10 +359,10 @@
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@@ -379,10 +387,10 @@
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@@ -400,37 +408,64 @@
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-                "sha256:63b52e3c866428a224f97cab011de738c36aec0185aa91cfacd418b5d58911d1",
-                "sha256:ec22d826a36ed72a7358ff3fe56cbd4ba69dd7a6718ffd450ff0e9df7a47ce6a"
+                "sha256:7bf2a778576d825600030a110f3c0e3e8edc51dfaafe1c146e39a2027784957b",
+                "sha256:502a824f31acdacb3a35b6690b5fbf0bc41d63a24a45c4004352b0242707598e"
             ],
-            "version": "==2.19.1"
+            "version": "==2.21.0"
         },
         "six": {
             "hashes": [
-                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb",
-                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9"
+                "sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c",
+                "sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"
             ],
-            "version": "==1.11.0"
+            "version": "==1.12.0"
         },
         "snowballstemmer": {
             "hashes": [
@@ -441,10 +476,10 @@
         },
         "sphinx": {
             "hashes": [
-                "sha256:d719de667218d763e8fd144b7fcfeefd8d434a6201f76bf9f0f0c1fa6f47fcdb",
-                "sha256:a07050845cc9a2f4026a6035cc8ed795a5ce7be6528bbc82032385c10807dfe7"
+                "sha256:429e3172466df289f0f742471d7e30ba3ee11f3b5aecd9a840480d03f14bcfe5",
+                "sha256:c4cb17ba44acffae3d3209646b6baec1e215cad3065e852c68cc569d4df1b9f8"
             ],
-            "version": "==1.7.8"
+            "version": "==1.8.3"
         },
         "sphinxcontrib-websupport": {
             "hashes": [
@@ -455,10 +490,10 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b",
-                "sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f"
+                "sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39",
+                "sha256:de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22"
             ],
-            "version": "==1.22"
+            "version": "==1.24.1"
         }
     }
 }
diff --git a/requirements-docs.txt b/requirements-docs.txt
index 6b94d118..3e056179 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -1,2 +1,2 @@
-sphinx==1.7.8
+sphinx==1.8.3
 ghp-import==0.5.5
diff --git a/requirements.txt b/requirements.txt
index 890a65f0..9af58277 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,23 +1,23 @@
 # pip
 # wheel
 
-cython==0.28.5
+cython==0.29.2
 
 # key components for improving Python project
 # we will install them on "Testing" section
 # but let's lock version here and use bot to trigger each version update
-pydocstyle==2.1.1
-pylint==2.1.1
+pydocstyle==3.0.0
+pylint==2.2.2
 # flake8==3.4.1
 mypy-lang==0.5.0
-coverage==4.5.1
+coverage==4.5.2
 
 # Testing
-pytest==3.7.4
+pytest==4.0.2
 # pytest-flake8==0.8.1  # pytest plugin of flake8
-pytest-pylint==0.12.3    # pytest plugin of pylint
+pytest-pylint==0.13.0    # pytest plugin of pylint
 pytest-mypy==0.3.2      # pytest plugin of mypy
-pytest-cov==2.5.1       # testing coverage
+pytest-cov==2.6.0       # testing coverage
 pytest-runner==4.2   # add setup.py test support for pytest
 
-coveralls==1.5.0
+coveralls==1.5.1