brew-desc: remove finch

We merged Finch into Pidgin in [this Homebrew
commit](https://github.com/Homebrew/homebrew/commit/7537f3663d0ca35e5848
d0a9644ebc86c92d267f).
Merge branch 'finchmeister' of https://github.com/DomT4/homebrew-desc into DomT4-finchmeister
Remove finch (thanks @DomT4)
Bump version