Interrupt management is supported with properties, and fixed some typos as well.
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).
To use in CPython, `pip install adafruit-circuitpython-mcp230xx`.
Read the [docs](http://circuitpython.readthedocs.io/projects/mcp230xx/en/latest/) for info on how to use it.