Fixed documentation for `add_value()` so the the docstring would render correctly with `sphinx`. No functional changes were made since last release. Thanks nicolasff!
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-display-shapes`.
Read the [docs](http://circuitpython.readthedocs.io/projects/display-shapes/en/latest/) for info on how to use it.