[Feature Request] critical - warning - good - warning - critical

[FunDeckHermit]

Hi,

I monitor cell voltages of a battery and would like to use this plugin.

• Cells have a sweet spot around 2.5 - 3.1V
• Around that is a warning: 2.4 - 2.5 V and 3.1 - 3.2 V
• Everything else is critical: < 2.4 V and > 3.3V

As a quick fix i'm:

• subtracting the value by 2.8
• abs of the remainer
• that result + 2.8