When adding a REST API and Choosing Lambda Language Ruby is not available.

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[official AWS Amplify Console forum](https://forums.aws.amazon.com/forum.jspa?forumID=314&start=0)

**Is your feature request related to a problem? Please describe.**

No Ruby

**Describe the solution you'd like**
Please add ruby

**Describe alternatives you've considered**
remove all other languages besides ruby

**Additional context**
ruby is the ultimate language.