Adding 80% of battery Notification

[karolstanczyk]

Please consider to add notification also when battery reached 80% of charge. It will help users, who are trying to keep them between 20%-80% for most of the time to extend battery life.

[jelflein]

You can clone this repository (https://github.com/jelflein/apple-juice/tree/patch-1) and build it by your self.