Release 2.12.0

• Add default date to bulk_create_with_history and bulk_update_with_history (gh-687)
• Exclude ManyToManyFields when using bulk_create_with_history (gh-699)
• Added --excluded_fields argument to clean_duplicate_history command (gh-674)
• Exclude ManyToManyFields when fetching excluded fields (gh-707)
• Use default model manager for bulk_create_with_history and
  bulk_update_with_history instead of objects (gh-703)
• Add optional manager argument to bulk_update_with_history to use instead of
  the default manager (gh-703)
• Add support for Django 3.1 (gh-713)
• Fix a bug with clean_old_history command's --days argument (gh-722)

* NOTE: This will be the last minor release before 3.0.0.