This update adds a double buffer for optimized drawing by only updating pixels that have changed.
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-pixel-framebuf`.
Read the [docs](http://circuitpython.readthedocs.io/projects/pixel_framebuf/en/latest/) for info on how to use it.