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- Removed support for Python 2.7.
- Added support for Python 3.8 and Django 3.1.
- Removed the following classes (use the class in parentheses instead):
- ``BaseFormSetMixin`` (use ``BaseFormSetFactory``).
- ``BaseInlineFormSetMixin`` (use ``BaseInlineFormSetFactory``).
- ``InlineFormSet`` (use ``InlineFormSetFactory``).
- ``BaseGenericInlineFormSetMixin`` (use ``BaseGenericInlineFormSetFactory``).
- ``GenericInlineFormSet`` (use ``GenericInlineFormSetFactory``).