Ndh

- :warning: BREAKING :warning: bootstrap 4 → 5. Please read
[boostrap 5 migration guide](https://getbootstrap.com/docs/5.1/migration/) and
[django-bootstrap5 migration guide](https://django-bootstrap5.readthedocs.io/en/latest/migrate.html)
- :warning: BREAKING :warning: remove deprecated `enum_to_choices`
- require django >= 3

- fix release action

- add README on PyPI

- :warning: deprecated enum_to_choices, as a better version is available in django 3.0.
- added output_field argument for query_sum, and a unit test
- added documentation
- added changelog
- setup automatic publication on PyPI & Docker Hub
- internaly fixed W042
- internaly switched from pipenv to poetry
- internaly switched from travis to github actions
- internaly switched from coveralls to codecov