Version v1.2.0 - magsafe turns green when maintain level was reached

This release brings the GUI up to date with the CLI update that makes the magsafe led turn green when the battery limit is reached.

Thanks to everyone in #71, notably: @jakjakob, @omniwired, and @ibrado.

Please test this and let me know if it performs as expected, I'm on battery power while traveling.

Full Changelog: v1.1.6...v1.2.0