diff --git a/Pipfile.lock b/Pipfile.lock
index fc4084f..867e9f3 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -3,19 +3,6 @@
         "hash": {
             "sha256": "6932d3683705df0203f4d41a10b2b19d864c95fea7878e1cb59803a4f707dcdd"
         },
-        "host-environment-markers": {
-            "implementation_name": "cpython",
-            "implementation_version": "3.6.0",
-            "os_name": "posix",
-            "platform_machine": "x86_64",
-            "platform_python_implementation": "CPython",
-            "platform_release": "4.4.0-101-generic",
-            "platform_system": "Linux",
-            "platform_version": "#124-Ubuntu SMP Fri Nov 10 18:29:59 UTC 2017",
-            "python_full_version": "3.6.0",
-            "python_version": "3.6",
-            "sys_platform": "linux"
-        },
         "pipfile-spec": 6,
         "requires": {
             "python_version": "3.6"
@@ -32,44 +19,49 @@
     "develop": {
         "attrs": {
             "hashes": [
-                "sha256:a17a9573a6f475c99b551c0e0a812707ddda1ec9653bed04c13841404ed6f450",
-                "sha256:1c7960ccfd6a005cd9f7ba884e6316b5e430a3f1a6c37c5f87d8b43f83b54ec9"
+                "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
             ],
-            "version": "==17.4.0"
+            "version": "==20.3.0"
         },
         "pluggy": {
             "hashes": [
-                "sha256:7f8ae7f5bdf75671a718d2daf0a64b7885f74510bcd98b1a0bb420eb9a9d0cff"
+                "sha256:7f8ae7f5bdf75671a718d2daf0a64b7885f74510bcd98b1a0bb420eb9a9d0cff",
+                "sha256:d345c8fe681115900d6da8d048ba67c25df42973bda370783cd58826442dcd7c",
+                "sha256:e160a7fcf25762bb60efc7e171d4497ff1d8d2d75a3d0df7a21b76821ecbf5c5"
             ],
             "version": "==0.6.0"
         },
         "py": {
             "hashes": [
-                "sha256:8cca5c229d225f8c1e3085be4fcf306090b00850fefad892f9d96c7b6e2f310f",
-                "sha256:ca18943e28235417756316bfada6cd96b23ce60dd532642690dcfdaba988a76d"
+                "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
+                "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
             ],
-            "version": "==1.5.2"
+            "index": "pypi",
+            "version": "==1.10.0"
         },
         "pytest": {
             "hashes": [
-                "sha256:b84878865558194630c6147f44bdaef27222a9f153bbd4a08908b16bf285e0b1",
-                "sha256:53548280ede7818f4dc2ad96608b9f08ae2cc2ca3874f2ceb6f97e3583f25bc4"
+                "sha256:53548280ede7818f4dc2ad96608b9f08ae2cc2ca3874f2ceb6f97e3583f25bc4",
+                "sha256:b84878865558194630c6147f44bdaef27222a9f153bbd4a08908b16bf285e0b1"
             ],
+            "index": "pypi",
             "version": "==3.3.2"
         },
         "pytest-runner": {
             "hashes": [
-                "sha256:71e581622a1fad23cf12c1c1bd23e826e3358ab10b28c6e7e1a88f2f4489bf2f",
-                "sha256:0f7c3a3cf5aead13f54baaa01ceb49e5ae92aba5d3ff1928e81e189c40bc6703"
+                "sha256:0f7c3a3cf5aead13f54baaa01ceb49e5ae92aba5d3ff1928e81e189c40bc6703",
+                "sha256:71e581622a1fad23cf12c1c1bd23e826e3358ab10b28c6e7e1a88f2f4489bf2f"
             ],
+            "index": "pypi",
             "version": "==3.0"
         },
         "six": {
             "hashes": [
-                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb",
-                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9"
+                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
+                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
             ],
-            "version": "==1.11.0"
+            "version": "==1.15.0"
         }
     }
 }