* Implement WAQI sensor
* Corrections based on CI check.
* Updated requirements_all.txt for pwaqi==1.2
* Require latest version of pwaqi
* Fix lint: single argument for .exception and no more pass statement.
* Further lint fixes.
* pydocstyle fix
* Implement rate throttle.
Data on WAQI is usually updated once an hour - make it refresh every thirty minutes.
* Implement schema validation with voluptuous.
Change exception handling scope.
Move messages to debug().
* Fix lint (empty indented line).
* Sort lines correctly.
* Fix last lint issue.
* Provide additional sensor data as received from WAQI.
Easier-to-read throttle timing.
* Additional object attributes to be unrolled later.
Fabian Affolter
Valentin Alexeev