Django-better-migrations

- By default, dunamai expects a `v` prefix on tags. Fix that.

* Enable dynamic versionning (12) ewjoachim

What's Changed
* Fix authors format by ewjoachim in https://github.com/botify-labs/django-better-migrations/pull/10

**Full Changelog**: https://github.com/botify-labs/django-better-migrations/compare/1.0.0...1.0.1

* Redo app boilerplate and add compatibility with Django up to 4.1 (6) ewjoachim
* Create ci.yml (7) ewjoachim
* Allow dropping a not null constraint (2) David-Wobrock
* Fix Travis badge (5) David-Wobrock
* ALLOW_ENGINES settings (1) AdeleD