Django-reversion

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- Fix admin detail view in multi-database configuration (atten).

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- Added support for using django-reversion contexts in ``asyncio`` tasks (bellini666).
- **Breaking:** Dropped support for Python 3.6.

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- Improved performance of `createinitialrevisions` management command (philipstarkey).

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- Django 4.0b support (smithdc1, kevinmarsh).
- Optimized ``VersionQuerySet.get_deleted``.

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- **Breaking:** The ``create_revision`` view decorator and ``RevisionMiddleware`` no longer roll back the revision and
database transaction on response status code >= 400. It's the responsibility of the view to use `transaction.atomic()`
to roll back any invalid data. This can be enabled globally by setting ``ATOMIC_REQUESTS=True``. (etianen)

https://docs.djangoproject.com/en/3.1/ref/settings/#std:setting-DATABASE-ATOMIC_REQUESTS

- Fixing gettext plural forms with Django (martinsvoboda).
- Deprecation removals (lociii, Peter-van-Tol).
- CI testing improvements (etianen, michael-k).
- Documentation fixes (erikrw, jedie, michael-k).

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- Significant speedup to ``Version.objects.get_deleted(...)`` database query for PostgreSQL (GeyseR).
- Testing against Django 3.1 (michael-k).
- Django 4.0 compatibility improvements (GitRon).