fix(package): update graphql-type-json to version 0.3.1

Closes #12

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "babel-runtime": "^6.26.0",
     "change-case": "^3.0.2",
     "graphql-list-fields": "^2.0.1",
-    "graphql-type-json": "^0.2.0",
+    "graphql-type-json": "^0.3.1",
     "lodash": "^4.17.5",
     "parse": "^1.11.0"
   },