added enum34 to fix tests

Pipfile

@@ -12,6 +12,7 @@ coveralls = "*"
 mock = "*"
 pytest-mock = "*"
 pre-commit = "*"
+"enum34" = "*"
 
 [requires]
 python_version = "3.6"

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "d7e512d179e8b07efc5d17d5eced57150bb8acaa8ec49e1ce0179d75c4401663"
+            "sha256": "80455ae8142b03b61e4237997c596fc403f61096db8ca17648f8a01b7e48f0f9"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -117,6 +117,16 @@
             ],
             "version": "==0.6.2"
         },
+        "enum34": {
+            "hashes": [
+                "sha256:2d81cbbe0e73112bdfe6ef8576f2238f2ba27dd0d55752a776c41d38b7da2850",
+                "sha256:644837f692e5f550741432dd3f223bbb9852018674981b1664e5dc339387588a",
+                "sha256:6bd0f6ad48ec2aa117d3d141940d484deccda84d4fcd884f5c3d93c23ecd8c79",
+                "sha256:8ad8c4783bf61ded74527bffb48ed9b54166685e4230386a9ed9b1279e2df5b1"
+            ],
+            "index": "pypi",
+            "version": "==1.1.6"
+        },
         "flake8": {
             "hashes": [
                 "sha256:7253265f7abd8b313e3892944044a365e3f4ac3fcdcfb4298f55ee9ddf188ba0",