Fixed an issue where this library couldn't be imported on Blinka platforms that did not implement `pwmio.PWMOut`. This was an issue when using other libraries such as `adafruit_motorkit` which would otherwise be functional on those platforms. Please note this only fixes the issue with importing for type annotations, and does not add `pwmio.PWMOut` functionality.
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-motor`.
Read the [docs](http://circuitpython.readthedocs.io/projects/motor/en/latest/) for info on how to use it.