New version coming with a breaking change!

[KenjiTakahashi]

Current master includes a redoing of the State field that can be potentially breaking some use cases. See https://github.com/distatus/battery/blob/master/BREAKING.md for more details.
In a couple of days I will have to go offline again for a few weeks, that's why I do not want to make a release at this time.
In the meantime, users of the library are encouraged to give current master branch a try and report problems, if any.

I plan to cut the next release ~mid June. After addressing possible bugs, of course.