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* Drop support for Django 2.1
* Fix compatibility with UUIDField primary keys
* Fix formatting for pyupgrade
* Fix error with get_objects_for_user on PostgreSQL
* Modify 'assign_perm' shortcut to treat lists as a queryset
* Updated links to Django documentation and django-authority repository
* Removed reference to "easy_install" in the documentation
* Run migrations check only if required version of django is installed