Thanks for all the work that went into this awesome project!

Describe the issue/behavior that seems buggy

The file SUPPORTED_LANGUAGES.md is not up to date.

For instance, ceylon is not mentioned, while there is a ceylon.js file in languages.

Moreover, the aliases also do not seem to be up to date: closure is listed to have aliases clojure and clj while the closure.js file lists clojure, clj and edn.