Add pylint to pipfile

Pipfile

@@ -9,6 +9,7 @@ pytest = "*"
 pytest-vcr = "*"
 tox = "*"
 tox-venv = "*"
+pylint = "*"
 
 [packages]
 appdirs = "*"

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "4b4c44aab26a3ad47095b60d99d18d3774802caccc9b5dcbdd727765947a1b22"
+            "sha256": "a369f80373274e99e967fe2f267be5b19893c3bc9e2d56028b84a0af0c814ea6"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -144,6 +144,14 @@
             "index": "pypi",
             "version": "==1.4.4"
         },
+        "astroid": {
+            "hashes": [
+                "sha256:6b0ed1af831570e500e2437625979eaa3b36011f66ddfc4ce930128610258ca9",
+                "sha256:cd80bf957c49765dce6d92c43163ff9d2abc43132ce64d4b1b47717c6d2522df"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==2.5.2"
+        },
         "attrs": {
             "hashes": [
                 "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
@@ -181,6 +189,49 @@
             ],
             "version": "==1.1.1"
         },
+        "isort": {
+            "hashes": [
+                "sha256:0a943902919f65c5684ac4e0154b1ad4fac6dcaa5d9f3426b732f1c8b5419be6",
+                "sha256:2bb1680aad211e3c9944dbce1d4ba09a989f04e238296c87fe2139faa26d655d"
+            ],
+            "markers": "python_version >= '3.6' and python_version < '4.0'",
+            "version": "==5.8.0"
+        },
+        "lazy-object-proxy": {
+            "hashes": [
+                "sha256:17e0967ba374fc24141738c69736da90e94419338fd4c7c7bef01ee26b339653",
+                "sha256:1fee665d2638491f4d6e55bd483e15ef21f6c8c2095f235fef72601021e64f61",
+                "sha256:22ddd618cefe54305df49e4c069fa65715be4ad0e78e8d252a33debf00f6ede2",
+                "sha256:24a5045889cc2729033b3e604d496c2b6f588c754f7a62027ad4437a7ecc4837",
+                "sha256:410283732af311b51b837894fa2f24f2c0039aa7f220135192b38fcc42bd43d3",
+                "sha256:4732c765372bd78a2d6b2150a6e99d00a78ec963375f236979c0626b97ed8e43",
+                "sha256:489000d368377571c6f982fba6497f2aa13c6d1facc40660963da62f5c379726",
+                "sha256:4f60460e9f1eb632584c9685bccea152f4ac2130e299784dbaf9fae9f49891b3",
+                "sha256:5743a5ab42ae40caa8421b320ebf3a998f89c85cdc8376d6b2e00bd12bd1b587",
+                "sha256:85fb7608121fd5621cc4377a8961d0b32ccf84a7285b4f1d21988b2eae2868e8",
+                "sha256:9698110e36e2df951c7c36b6729e96429c9c32b3331989ef19976592c5f3c77a",
+                "sha256:9d397bf41caad3f489e10774667310d73cb9c4258e9aed94b9ec734b34b495fd",
+                "sha256:b579f8acbf2bdd9ea200b1d5dea36abd93cabf56cf626ab9c744a432e15c815f",
+                "sha256:b865b01a2e7f96db0c5d12cfea590f98d8c5ba64ad222300d93ce6ff9138bcad",
+                "sha256:bf34e368e8dd976423396555078def5cfc3039ebc6fc06d1ae2c5a65eebbcde4",
+                "sha256:c6938967f8528b3668622a9ed3b31d145fab161a32f5891ea7b84f6b790be05b",
+                "sha256:d1c2676e3d840852a2de7c7d5d76407c772927addff8d742b9808fe0afccebdf",
+                "sha256:d7124f52f3bd259f510651450e18e0fd081ed82f3c08541dffc7b94b883aa981",
+                "sha256:d900d949b707778696fdf01036f58c9876a0d8bfe116e8d220cfd4b15f14e741",
+                "sha256:ebfd274dcd5133e0afae738e6d9da4323c3eb021b3e13052d8cbd0e457b1256e",
+                "sha256:ed361bb83436f117f9917d282a456f9e5009ea12fd6de8742d1a4752c3017e93",
+                "sha256:f5144c75445ae3ca2057faac03fda5a902eff196702b0a24daf1d6ce0650514b"
+            ],
+            "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"
+        },
+        "mccabe": {
+            "hashes": [
+                "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
+                "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"
+            ],
+            "version": "==0.6.1"
+        },
         "multidict": {
             "hashes": [
                 "sha256:018132dbd8688c7a69ad89c4a3f39ea2f9f33302ebe567a879da8f4ca73f0d0a",
@@ -248,6 +299,14 @@
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==1.10.0"
         },
+        "pylint": {
+            "hashes": [
+                "sha256:209d712ec870a0182df034ae19f347e725c1e615b2269519ab58a35b3fcbbe7a",
+                "sha256:bd38914c7731cdc518634a8d3c5585951302b6e2b6de60fbb3f7a0220e21eeee"
+            ],
+            "index": "pypi",
+            "version": "==2.7.4"
+        },
         "pyparsing": {
             "hashes": [
                 "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1",
@@ -258,11 +317,11 @@
         },
         "pytest": {
             "hashes": [
-                "sha256:9d1edf9e7d0b84d72ea3dbcdfd22b35fb543a5e8f2a60092dd578936bf63d7f9",
-                "sha256:b574b57423e818210672e07ca1fa90aaf194a4f63f3ab909a2c67ebb22913839"
+                "sha256:671238a46e4df0f3498d1c3270e5deb9b32d25134c99b7d75370a68cfbe9b634",
+                "sha256:6ad9c7bdf517a808242b998ac20063c41532a570d088d77eec1ee12b0b5574bc"
             ],
             "index": "pypi",
-            "version": "==6.2.2"
+            "version": "==6.2.3"
         },
         "pytest-vcr": {
             "hashes": [
@@ -274,11 +333,11 @@
         },
         "python-dotenv": {
             "hashes": [
-                "sha256:31d752f5b748f4e292448c9a0cac6a08ed5e6f4cefab85044462dcad56905cec",
-                "sha256:9fa413c37d4652d3fa02fea0ff465c384f5db75eab259c4fc5d0c5b8bf20edd4"
+                "sha256:471b782da0af10da1a80341e8438fca5fadeba2881c54360d5fd8d03d03a4f4a",
+                "sha256:49782a97c9d641e8a09ae1d9af0856cc587c8d2474919342d5104d85be9890b2"
             ],
             "index": "pypi",
-            "version": "==0.16.0"
+            "version": "==0.17.0"
         },
         "pyyaml": {
             "hashes": [