findLastIndex

[aleksei-berezkin]

Hi, first thanks for your great lib which I'm happy to use in my projects. Recently ran into an issue: needed findLastIndex() which is not implemented. If you are ok with it, I'm ready to make pull request.

[redbar0n]

@funkia @paldepind

[paldepind]

Having findLastIndex would be great. PRs are appreciated! :)