Now assumes 4.2V battery instead of 4.35V
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-lc709203f`.
Read the [docs](http://circuitpython.readthedocs.io/projects/lc709203f/en/latest/) for info on how to use it.