Breaking Changes for next minor version
- Pass response as second argument to thunk
  Follow express-graphql
  https://github.com/graphql/express-graphql/commit/d647019073c623097173fb0377cc309e572d2e2f

``` js
app.use(urlString(), graphqlHTTP((request, ctx) => {})
```

will become:

``` js
app.use(urlString(), graphqlHTTP((request, response, ctx) => {})
```
