I just noticed Lucide icons:
This is a fork of Feather, which is up-to-date. Feather has only 287 icons, Lucide has 1701 (and they have, of course, most if not all the missing icons).
Both sets are under MIT licence.
So I guess in this case support for Feather should be dropped, and replaced by Lucide.
My pull request seems a bit meaningless now 
Perhaps I can try creating a repo for this set, if approved by the team…