Requesting support for Low Battery warning
**Describe the solution you'd like:**
Homebridge-myq doesn't seem capable of supporting the low battery warning as generated from the MyQ "add-on" kit. 

The following message is displayed in the Homebridge log for this plug-in
[homebridge-myq] This plugin generated a warning from the characteristic 'Status Low Battery': Characteristic not in required or optional characteristic section for service GarageDoorOpener.

