Low battery no working?
Hi,
Looks like some of my accessories (temperature sensor and motion sensors) are now running low battery <5%, but in Home app I don't see any low battery warning.
I know based on Homebridge API that it's possible to set low battery level:
	batteryService.getCharacteristic(Characteristic.StatusLowBattery).on('get', that.getBatteryLow.bind(that));
Basically the method getBatteryLow returns true of false depending on if the battery is below certain percentage (suggest 10% for the sensors). 
Can I request to add this as a new feature? Thank you!
