- Trim plural variants in fluent.migrate `PLURALS()` ([Bug 1794286](https://bugzilla.mozilla.org/show_bug.cgi?1794286))
- Update dependencies to compare-locales 9.0.1 & fluent.syntax 0.19.0
- Add support for Python 3.8, 3.9 & 3.10
- Drop Python 2 support
- Drop Windows support
- Drop dependency on six
- Update contact details, including new [repo URL](https://github.com/mozilla/fluent-migrate)