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* Drop support Django < 2.2
* Official Django 3.2 support
* Official Django 3.1 support
* Official python 3.8 and 3.9 support
* MassUpdate: add new settings configuration `UPDATE_ACTION_IGNORED_FIELDS`. (thanks PetrKudy)
* Merge: add new settings configuration `MERGE_ACTION_IGNORED_FIELDS`. (thanks PetrKudy)
* change create_extra_permission to be executed after all other migrations
* add `create_extra_permission` to handle situaations where permissions are not created for all models