Django-polymorphic

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* Added support for Django 4.0.
* Fixed crash when the admin "add type" view has no choices; will show a permission denied.
* Fixed missing ``locale`` folder in sdist.
* Fixed missing ``QuerySet.bulk_create(.., ignore_conflicts=True)`` parameter support.
* Fixed ``FilteredRelation`` support.
* Fixed supporting class keyword arguments in model definitions for ``__init_subclass__()``.
* Fixed including ``polymorphic.tests.migrations`` in the sdist.
* Fixed non-polymorphic parent handling, which has no ``_base_objects``.
* Fixed missing ``widgets`` support for ``modelform_factory()``.
* Fixed ``has_changed`` handling for ``polymorphic_ctype_id`` due to implicit str to int conversions.
* Fixed ``Q`` object handling when lists are used (e.g. in django-advanced-filters_).
* Fixed Django Admin support when using a script-prefix.

Many thanks to everyone providing clear pull requests!

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* Support for Django 3.X
* Dropped support for python 2.X
* A lot of various fixes and improvements by various authors. Thanks a lot!

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* Fix ``PolymorphicInlineModelAdmin`` media jQuery include for Django 2.0+

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* Fixed admin import error due to ``isort`` changes.

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* Added Django 2.2 support.
* Changed ``.non_polymorphic()``, to use a different iterable class that completely cirvumvent polymorphic.
* Changed SQL for ``instance_of`` filter: use ``IN`` statement instead of ``OR`` clauses.
* Changed queryset iteration to implement ``prefetch_related()`` support.
* Fixed Django 3.0 alpha compatibility.
* Fixed compatibility with current django-extra-views_ in ``polymorphic.contrib.extra_views``.
* Fixed ``prefetch_related()`` support on polymorphic M2M relations.
* Fixed model subclass ``___`` selector for abstract/proxy models.
* Fixed model subclass ``___`` selector for models with a custom ``OneToOneField(parent_link=True)``.
* Fixed unwanted results on calling ``queryset.get_real_instances([])``.
* Fixed unwanted ``TypeError`` exception when ``PolymorphicTypeInvalid`` should have raised.
* Fixed hiding the add-button of polymorphic lines in the Django admin.
* Reformatted all files with black

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* Fixed admin crash for Django 2.1 with missing ``use_required_attribute``.