Bump django-polymorphic from 1.3 to 3.0.0

[dependabot-preview]

Bumps django-polymorphic from 1.3 to 3.0.0.

Changelog

Sourced from django-polymorphic's changelog.

Changes in 3.0.0 (2020-08-21)

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

Changes in 2.1.2 (2019-07-15)

• Fix PolymorphicInlineModelAdmin media jQuery include for Django 2.0+

Changes in 2.1.1 (2019-07-15)

• Fixed admin import error due to isort changes.

Changes in 2.1 (2019-07-15)

• 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

Changes in 2.0.3 (2018-08-24)

• Fixed admin crash for Django 2.1 with missing use_required_attribute.

Changes in 2.0.2 (2018-02-05)

• Fixed manager inheritance behavior for Django 1.11, by automatically enabling Meta.manager_inheritance_from_future if it's not defined. This restores the manager inheritance behavior that django-polymorphic 1.3 provided for Django 1.x projects.
• Fixed internal base_objects usage.

Changes in 2.0.1 (2018-02-05)

• Fixed manager inheritance detection for Django 1.11.

Commits

• b4efb59 Release 3.0.0
• c005410 Merge pull request #461 from AdamDonna/fix/455/failures_on_django_master
• fa6808e Use conditional function definition
• 45215ff Add little docstring and typo fix
• d93f178 Side load _filter_or_exclude to avoid recursion
• 21f635d Backwards compatible _filter_or_exclude
• 0232bef Attempted fix for failures on master
• 69bbe58 Travis should run everywhere
• fd300df Merge pull request #456 from Djailla/misc
• 613dd3d Merge pull request #459 from chrisglass/make-tests-pass-travis-tentative
• Additional commits viewable in compare view

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