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Added
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- Add support for Python 3.10
Changed
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- **BACKWARD INCOMPATIBLE:** Drop support for ``Django`` 3.0 and 3.1
- **BACKWARD INCOMPATIBLE:** Require ``Django Priority Batch`` version 4
- Bump requirements version
Change DEFAULT_AUTO_FIELD settings back to AutoField
Due to bug in Django 3.12, which fails to recreate foreign key
constraints on auto-generated through tables
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