diff --git a/Pipfile.lock b/Pipfile.lock
index d50fa55..45afbac 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -22,6 +22,13 @@
         }
     },
     "develop": {
+        "attrs": {
+            "hashes": [
+                "sha256:69c0dbf2ed392de1cb5ec704444b08a5ef81680a61cb899dc08127123af36a79",
+                "sha256:f0b870f674851ecbfbbbd364d6b5cbdff9dcedbc7f3f5e18a6891057f21fe399"
+            ],
+            "version": "==19.1.0"
+        },
         "certifi": {
             "hashes": [
                 "sha256:47f9c83ef4c0c621eaef743f133f09fa8a74a9b75f037e8624f83bd1b6626cb7",
@@ -82,11 +89,11 @@
         },
         "coveralls": {
             "hashes": [
-                "sha256:ab638e88d38916a6cedbf80a9cd8992d5fa55c77ab755e262e00b36792b7cd6d",
-                "sha256:b2388747e2529fa4c669fb1e3e2756e4e07b6ee56c7d9fce05f35ccccc913aa0"
+                "sha256:6f213e461390973f4a97fb9e9d4ebd4956af296ff0a4d868e622108145835cb7",
+                "sha256:a7d0078c9e9b5692c03dcd3884647e837836c265c01e98094632feadef767d36"
             ],
             "index": "pypi",
-            "version": "==1.5.1"
+            "version": "==1.6.0"
         },
         "docopt": {
             "hashes": [
@@ -103,11 +110,11 @@
         },
         "jsonschema": {
             "hashes": [
-                "sha256:000e68abd33c972a5248544925a0cae7d1125f9bf6c58280d37546b946769a08",
-                "sha256:6ff5f3180870836cae40f06fa10419f557208175f13ad7bc26caa77beb1f6e02"
+                "sha256:0c0a81564f181de3212efa2d17de1910f8732fa1b71c42266d983cd74304e20d",
+                "sha256:a5f6559964a3851f59040d3b961de5e68e70971afb88ba519d27e6a039efff1a"
             ],
             "index": "pypi",
-            "version": "==2.6.0"
+            "version": "==3.0.1"
         },
         "nose": {
             "hashes": [
@@ -118,6 +125,12 @@
             "index": "pypi",
             "version": "==1.3.7"
         },
+        "pyrsistent": {
+            "hashes": [
+                "sha256:3ca82748918eb65e2d89f222b702277099aca77e34843c5eb9d52451173970e2"
+            ],
+            "version": "==0.14.11"
+        },
         "requests": {
             "hashes": [
                 "sha256:502a824f31acdacb3a35b6690b5fbf0bc41d63a24a45c4004352b0242707598e",
@@ -125,6 +138,13 @@
             ],
             "version": "==2.21.0"
         },
+        "six": {
+            "hashes": [
+                "sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c",
+                "sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"
+            ],
+            "version": "==1.12.0"
+        },
         "urllib3": {
             "hashes": [
                 "sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39",