Enable core-js in all JavaScript katas

[alex-morgun]

Current javascript catas are limited and frustrating.
Some of them even does not have latest node support and lacking contemporary futures.
It would be easy to include Core-JS profile to allow bleeding-edge javascript one-liners.

https://github.com/zloirock/core-js

[hobovsky]

Appropriate way to request a new language, language version, or a library, is to create a ticket in codewars/runner repository. Please create a ticket there, using an appropriate template.

Closing the discussion as off-topic for this area.