- Added support for async methods to gsf decoder in python 3.6+
- Added `Grain.origin_timerange` method.
- Added `Grain.normalise_time` method.
- Added `Colourbars` test signal generator
- Added `MovingBarOverlay` for test signal generators
- Added `mediagrains.numpy` sublibrary for handling video grains as numpy arrays, in python 3.6+
- Added `PSNR` option to grain compare.
- Support for converting between all uncompressed video grain formats added to `mediagrains.numpy`
- This is the last release that will support python 2.7 (apart from bugfixes)