Aiobafi6

- Fixed OffOnAuto Python enum to match the protocol buffer (AUTO was incorrectly defined as 3).
- Added unit tests for the protopro module.
- Export ZEROCONF_SERVICE_TYPE from the package and discovery module.

**Full Changelog**: https://github.com/jfroy/aiobafi6/compare/0.1.0...0.2.0

- Initial release