Low battery status warning

[jrusi]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
Receive notification of beacon's low battery

Additional context
Woud be very cool to see an exclamation mark by the device name informing that the battery is low and should be changed

[Alexander Heinrich]

We are not going to implement this, because it would require us to read the battery from a various differnt types of beacons, which is not possible.