Remove YANVI

The download for this *cask* is from mediafire. Similar to the case with
[FreeRapid](https://github.com/phinze/homebrew-cask/pull/615), having
the download source be a one click hoster means the download url expires
and is unreliable.

Will leave this open for a few days, in case someone has an alternative.
Merge pull request #3866 from vitorgalvao/remove-yanvi

Remove YANVI