fix(package): update graphql to version 14.5.8

Closes #38

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
     "compression": "^1.7.3",
     "cors": "^2.8.5",
     "express": "^4.16.4",
-    "graphql": "^0.13.2",
+    "graphql": "^14.5.8",
     "graphql-server-express": "^1.4.0",
     "graphql-tools": "^4.0.3",
     "helmet": "^3.14.0"