Django-moderation

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- Drop support of Django<2.2. Now it supports only Django>=2.2,<4
- Drop support of Python3.5. Now it supports only Python 3.6, 3.7, 3.8, 3.9
- Drop support of ``DJANGO_MODERATION_MODERATORS`` setting
- Formatted code with `black`
- Drop dependency `django-model-utils` which we used for Choices functionality
- Add partial support for Django 4.0 - remove ugettext, change `smart_text` to `smart_str`,
change `ifequal` template tag to `if`.

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- Drop support of Django<1.11. Now it supports only Django>=1.11,<=2.2
- Drop support of Python2. Now it supports only Python 3.5, 3.6, 3.7
- Minor changes at docs

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- Updated to support Django 1.7 - 1.9
- Added instructions for switching from South migrations to Django 1.7+ migrations
- Improved filter logic for Django 1.8+ to only create one additional query per queryset, instead of N additional queries (eg: one additional query per object in the querset)
- Renamed model fields to be shorter, less redundant, and more semantically correct
- Modified registry to add a ``moderation_status`` shortcut to registered models
- Added support for moderating multiple objects at once
- Changed model choice fields to use ``Choices`` from django-model-utils
- Deprecated the ``DJANGO_MODERATION_MODERATORS`` setting in favor of ``MODERATION_MODERATORS``, which does the same thing
- Improved default email template formatting
- PEP8 and Flake Fixups
- Internal code and documentation typo fixes
- Bug fixes (specifically, closes 87)

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- Added support for python 3.X
- Dropped support for python 2.5
- Dropped support for django 1.3
- Added support for ForeignKey relations

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- Added message backends
- Added support for custom user model
- Added support for django 1.6.X

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- Dropped support for django 1.2.X