This includes all changes up to 2020-12-16 17:36:21 +0000.

Note that this changes the way that losslessly-compressed JPEG files
(obtained with `cjxl input.jpeg output.jxl`) are encoded, and that
another update will do so again in a few days. If you have such files,
you should decompress them to JPEG using `djxl --jpeg` prior to
updating, to prepare them for later recompression.