Hasura Adds Support to MySQL

I can't see anything in the codebase yet, however there's a stub documentation for MySQL integration:

https://deploy-preview-5726--hasura-docs.netlify.app/graphql...

Yes, everyone loves postgres more than mysql, but the truth is, a lot of software uses mysql, and mysql has one distinct advantage over postgresql: better clustering support with vitess and galera. Postgresql _is_ making progress but it's still behind at this time.