Add new proprietary license or license rules

This is a somewhat arcane thing, but we better be able to either detect this as a license or a rule:

- https://github.com/search?q="ANTI-FASCIST-MIT+LICENSE%3A"&type=code
- https://github.com/VKEA/PrideCSS/blob/master/LICENSE
- https://github.com/jamiebuilds/anti-fascist-mit-license/blob/master/LICENSE
- https://app.unpkg.com/bgio-effects@0.7.1/files/README.md

To test before adding: is this detected by the unknown license detection?