What's Changed
* Add database index to object_pk field in BaseGenericObjectPermission by dblenkus in https://github.com/django-guardian/django-guardian/pull/614
* Fix broken Django doc link by johnthagen in https://github.com/django-guardian/django-guardian/pull/616
* Fix number of default Django permissions by johnthagen in https://github.com/django-guardian/django-guardian/pull/617
* Add PyPI badges by johnthagen in https://github.com/django-guardian/django-guardian/pull/619
* Fix grammar typo by johnthagen in https://github.com/django-guardian/django-guardian/pull/620
* Link to latest stable docs by johnthagen in https://github.com/django-guardian/django-guardian/pull/622
* Update example to be PEP8 compliant by johnthagen in https://github.com/django-guardian/django-guardian/pull/623
* Add missing parenthesis by johnthagen in https://github.com/django-guardian/django-guardian/pull/624
* Document how to enable django-grappelli integration in example project by johnthagen in https://github.com/django-guardian/django-guardian/pull/627
* Fix broken link by johnthagen in https://github.com/django-guardian/django-guardian/pull/626
* Link to latest stable docs by johnthagen in https://github.com/django-guardian/django-guardian/pull/625
* Use the correct DB in post_migration handler by AdamZ in https://github.com/django-guardian/django-guardian/pull/631
* Overly optimistic content type queries by qeternity in https://github.com/django-guardian/django-guardian/pull/633
* Auto prefetching for vanilla usecases by qeternity in https://github.com/django-guardian/django-guardian/pull/632
* Better cache eviction and testing by qeternity in https://github.com/django-guardian/django-guardian/pull/635
* Upgrade to use django.urls.path in routing by ad-m in https://github.com/django-guardian/django-guardian/pull/634
* Add migiration check by ad-m in https://github.com/django-guardian/django-guardian/pull/613
* Fixed import of FieldDoesNotExist exception. by felixxm in https://github.com/django-guardian/django-guardian/pull/645
* Replace deprecated admin_static with static by OskarPersson in https://github.com/django-guardian/django-guardian/pull/649
* Fix typos in mixins.py by Maxr1998 in https://github.com/django-guardian/django-guardian/pull/652
* Add support for Python 3.8 by michael-k in https://github.com/django-guardian/django-guardian/pull/656
* Upgrade syntax to Python 3 by ad-m in https://github.com/django-guardian/django-guardian/pull/655
* Don't initialise anonymous user on DB where it's not migrated by browniebroke in https://github.com/django-guardian/django-guardian/pull/651
* Feature: Custom generic object permission models by partimer in https://github.com/django-guardian/django-guardian/pull/657
* Remove setup_requires from setup.py by johnthagen in https://github.com/django-guardian/django-guardian/pull/638
* Allow object permissions with dots. by jonnyarnold in https://github.com/django-guardian/django-guardian/pull/641
* Add requirements (specifically, Django >= 2.1) to setup.py by kdmccormick in https://github.com/django-guardian/django-guardian/pull/646
* Add BaseObjectPermission and BaseGenericObjectPermission to models/__init__ import by partimer in https://github.com/django-guardian/django-guardian/pull/659
* staticfiles is depreceted since 2.1 by l0rb in https://github.com/django-guardian/django-guardian/pull/661
* Remove url from __all__ by davitovmasyan in https://github.com/django-guardian/django-guardian/pull/662
* Add support for Django 3.0 by michael-k in https://github.com/django-guardian/django-guardian/pull/667
* Remove use of deprecated function. by dmptrluke in https://github.com/django-guardian/django-guardian/pull/668
* Fix circular dependency by deferring get obj perms model call by partimer in https://github.com/django-guardian/django-guardian/pull/664
* Improve performance of get_objects_for_user, removing sets by woakas in https://github.com/django-guardian/django-guardian/pull/637
* Fix cache reuse and add tests that invoke backend by qeternity in https://github.com/django-guardian/django-guardian/pull/636
* Update get_users_with_perms() to avoid a large join by aaronmader in https://github.com/django-guardian/django-guardian/pull/548
* Update Django in example_project by ad-m in https://github.com/django-guardian/django-guardian/pull/672
* Fix simple typo: relase -> release by timgates42 in https://github.com/django-guardian/django-guardian/pull/674