QOI has a more comprehensive test suite

[nigeltao]

fpng's top-level README.md says "the [emphasis added] 184 QOI test images (note 182 of the qoi test images don't have alpha channels, so this is almost entirely a 24bpp test)".

QOI updated its test suite a month ago (phoboslab/qoi#69). The new suite contains 2848 images.

[richgel999]

We now have two PNG writers and one JPEG XL writer that are faster and compress better than QOI (especially with 32bpp). For fast PNG reading, we have Wuffs, which is 2-2.5x faster than other readers. So I'm not too concerned about comparisons to QOI now. I'll update the main page soon.

From:
https://twitter.com/jonsneyers/status/1483000547934449668