Django-reversion

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- Added ``use_natural_foreign_keys`` option to ``reversion.register()`` (matwey).
- Documentation improvments and minor fixes (ad-m, martey, annainfo, etianen, m4rk3r, adityakrgupta25, ekinertac).
- Dropped support for Django 1.11 LTS.

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- Removing deprecated usages of `ugettext_lazy` (François GUÉRIN).
- Slovenian translation (Bor Plestenjak).

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- Packaging improvements (michael-k).
- Removing deprecated usages of `force_text` (Tenzer).
- Documentation fixes (chicheng).

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- Improved performance of `get_deleted` for large datasets (jeremy-engel).
- Django 3.0 compatibility (claudep).
- Drops Django < 1.11 compatibility (claudep).
- Drops Python 2.7 compatibility (claudep).
- Fixed errors in management commands when `django.contrib.admin` is not in `INSTALLED_APPS` (irtimir).

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- Remove `django.contrib.admin` dependency from django-reversion (Aitor Ruano).
- README refactor (rhenter).
- Testing against Django 2.2 (claudep).

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- Improved performance of many reversion database queries using `EXISTS` subquery (MRigal).
- Added support for Django 2.1 `view` permission (ofw).