Pysma

Breaking changes
- Add exceptions and restructure _fetch_json (68)
- Refactored read_logger (70)
- Make SMA attributes private (76)

Other Changes
- Add missing assert in test (67)
- Add type annotations (69)
- Implement sphinx docs using google-style docstring (71, 73)
- Increase coverage to 100% (74)
- Make sure l10n is availble when not authenticated (75)

- Support Device Classes (57)
- Implement device sensor map (61)
- Adds support for Energy Meter and Battery devices
- `Sensors` object parameters have been changed.
- Removed sensors current_consumption and total_consumption (home-assistant/core49727)
- Reduce loglevel for notfound sensors (45cd922bf19adba9bb37a33c3082681a59b67b22)
- Add software version to device_info (66)