fix(package): update graphql to version 14.0.0

Closes #31

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "cors": "^2.8.4",
     "dotenv": "^5.0.1",
     "express": "^4.16.3",
-    "graphql": "^0.13.2",
+    "graphql": "^14.0.0",
     "graphql-yoga": "^1.13.1",
     "node-fetch": "^2.1.2",
     "prisma-binding": "^1.5.17",