This release includes a fix that allows the library to work on builds of Circuit Python that have longint disabled, such as the Pew Pew M4.
Negative height BMP files require longint in order to work. So they are not supported on builds without longint.
To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).
To use in CPython, `pip3 install adafruit-circuitpython-imageload`.
Read the [docs](http://circuitpython.readthedocs.io/projects/imageload/en/latest/) for info on how to use it.