Django-safedelete

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- Fix attribute error when union queryset of safe delete model with others 152
- SET related objects after deleting 156
- Avoiding recursive call for delete function. 121
- Add SAFE_DELETE_FIELD_NAME setting 164
- Move filter visibility logic to Query to fix subquery in annotations 160
- Add functions to customize the policies delete behavior 167

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- Drop support for Django < 2.2
- Fix deprecation warnings for Django 4.0

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- Add visibility filter for union operations 145
- Set related fields when soft deleted 144
- has_unique_fields() now takes into account unique_together option 147
- Fix filtering in subqueries 148

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- call self.save() instead of super in delete()

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- Admin action now warns if some objects weren't undeleted
- Remove some pre-Django 1.11 support

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- Django 3.0 compatibility