Multiple schema files using glob path

[aprat84]

About what you did in this pull request (#227) which is a great addition to the plugin, why not take it a step further and also support a glob path? Like so:

custom:
  appSync:
    schema: path/to/**/*.graphql

[bboure]

@aprat84 Sounds good.
Feel free to open a PR about this if you want to.

[bboure]

@aprat84 I just came across this article: https://aws.amazon.com/blogs/mobile/merging-graphql-schema-files-and-more-with-the-cli/

It might be interesting integrating the utility into the plugin.

[huntedman]

Can this be closed now due to #399?

[bboure]

Yes!! Thank you @huntedman

Closing now