fix(package): update graphql to version 0.12.2

Closes #30

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
   },
   "dependencies": {
     "dataloader": "^1.3.0",
-    "graphql": "^0.11.3",
+    "graphql": "^0.12.2",
     "graphql-server-micro": "^1.1.0",
     "graphql-tools": "^1.2.2",
     "micro": "^9.0.0",