fix(graphiql): upgrade codemirror-graphql to support [email protected]

Author: benjie

package.json

@@ -62,6 +62,7 @@
     "@types/jsonwebtoken": "<7.2.1",
     "@types/node": "^7.0.4",
     "@types/pluralize": "0.0.27",
+    "codemirror-graphql": "^0.6.12",
     "connect": "^3.5.0",
     "express": "^4.14.0",
     "graphiql": "^0.11.2",