Changed argument name in `DYMOScale.__init__()` from `units_pin` to `units_dio` to better clarify the type expected.
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-dymoscale`.
Read the [docs](http://circuitpython.readthedocs.io/projects/dymoscale/en/latest/) for info on how to use it.