A battery widget that works with Lenovo ThinkPad laptops using [tp_smapi](http://www.thinkwiki.org/wiki/Tp_smapi).
Includes hover notification with more details.
tpbatwidget = lain.widgets.contrib.tpbat()
Configuration is identical to [main bat widget's](https://github.com/copycat-killer/lain/wiki/bat).
