Move codemirror-graphql to a release version

[stevenmckinnon]

This issue pertains to the following package(s):

• GraphQL Playground - Electron App
• GraphQL Playground HTML
• GraphQL Playground
• GraphQL Playground Express Middleware
• GraphQL Playground Hapi Middleware
• GraphQL Playground Koa Middleware
• GraphQL Playground Lambda Middleware

What OS and OS version are you experiencing the issue(s) on?

Windows 7 Enterprise Edition

What version of graphql-playground(-electron/-middleware) are you experiencing the issue(s) on?

N/A

What is the expected behavior?

Be able to install graphql-playground-react

What is the actual behavior?

Unable to install due to "codemirror-graphql": "timsuchanek/codemirror-graphql#details-fix"
Using on company intranet so cannot SSH to github.

What steps may we take to reproduce the behavior?

upgrade "codemirror-graphql": "timsuchanek/codemirror-graphql#details-fix" to use a release version instead of a branch.

Please provide a gif or image of the issue for a quicker response/fix.

[kikar]

This has given me so many problems by installing in a Docker alpine image, and couldn't figure out why. Please update to a stable version.