fix(package): update graphql to version 14.0.0-rc.2

Closes #21

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "babel-core": "^6.26.0",
     "babel-polyfill": "^6.26.0",
     "express-graphql": "^0.6.11",
-    "graphql": "^0.12.3",
+    "graphql": "^14.0.0-rc.2",
     "node-fetch": "^1.7.3"
   },
   "jest": {