Fixed faulty type annotations, added type annotations for `animtaions.py`, and minor tweaks were made.
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-ht16k33`.
Read the [docs](http://circuitpython.readthedocs.io/projects/ht16k33/en/latest/) for info on how to use it.