Update package.json (#333)

Parity with @aws-amplify/api on graphql package dependency

Author: elorzafe

packages/aws-appsync/package.json

@@ -28,7 +28,7 @@
     "apollo-link-retry": "2.2.5",
     "aws-sdk": "2.329.0",
     "debug": "2.6.9",
-    "graphql": "^0.11.7",
+    "graphql": "0.13.0",
     "redux": "^3.7.2",
     "redux-thunk": "^2.2.0",
     "setimmediate": "^1.0.5",