incompatible with @graphql-eslint/eslint-plugin out of box

[JounQin]

That's because of eslint-plugin-graphql.

It wraps GraphQL source code into a js string tag, we supported this usage by mapping graphql to babel parser at #11.

But @graphql-eslint/eslint-plugin works with a custom estree-compatible parser, then the mapping is incorrect for it.

I'm going to raise a PR to support these two plugins/processors at the same time!

Related to dimaMachina/graphql-eslint#395