Pylovens

- Fix an issue where an exception is raised when the last full battery charge timestamp is missing
- Add a py.typed marker
- Minor cleanup

- Login is performed automatically. No need to call `login`
- Better exceptions when encountering authentication errors

**Full Changelog**: https://github.com/rogiervandergeer/pylovens/compare/0.2.0...0.2.1

**Full Changelog**: https://github.com/rogiervandergeer/pylovens/compare/0.1.0...0.2.0