Changes: https://github.com/adafruit/Adafruit_CircuitPython_MatrixKeypad/compare/1.2.15...1.2.16
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-matrixkeypad`.
Read the [docs](https://circuitpython.readthedocs.io/projects/matrixkeypad/en/latest/) for info on how to use it.