Django-perms-provisioner

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- Loosen dependency requirements of PyYAML
- Add test coverage for Python 3.9 and Django 3.1 & 3.2

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- Update regex to allow multiple underscores in permission names

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- Update PyYAML to resolve security issues
- Implement GitHub actions for testing / releasing

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- Add unit tests for loadperms happy flow
- Add unit tests for dumpperms happy flow
- Update schemas.PERMISSIONS_SCHEMA to remove deprecation warnings
- Update README file with clear instructions

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- Initial release with support for JSON and YAML