Support HM-CC-SCD (Luftgütesensor / CO2)
- Characteristic.AirQuality
- Characteristic.CarbonDioxideDetected
- Characteristic.CurrentTemperature

[Beispiel im Netatmo-Plugin](https://github.com/planetk/homebridge-netatmo/tree/master/service).

![85976_f01_gesensor](https://user-images.githubusercontent.com/264264/37026982-5743567e-2130-11e8-958e-a6149de446d1.jpg)
