Aiosomecomfort

Address typos in humidifier and dehumidifier funcitons

**Full Changelog**: https://github.com/mkmer/AIOSomecomfort/compare/0.0.27...0.0.28

Add humidifier / dehumidifier controls and properties.

**Full Changelog**: https://github.com/mkmer/AIOSomecomfort/compare/0.0.26...0.0.27
**Full Changelog**: https://github.com/mkmer/AIOSomecomfort/compare/0.0.25...0.0.27

Add `set_humidity(value)` function.
Update test.py to use set_humidity()

Add rate limit to refresh - if a login is in rate limit, inhibit refresh until rate limit has cleared

Address typo in len() comparison.

Detect redirects which indicate a backend error