Updated `show()` to utilize a single write to improve performance on SBCs. Thanks grouma!
To use in CircuitPython, simply install the [Adafruit CircuitPython Bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-sharpmemorydisplay`.
Read the [docs](http://circuitpython.readthedocs.io/projects/sharpmemorydisplay/en/latest/) for info on how to use it.