-[Breaking] Bump minimum Rust version to 1.46.0
-[Bugfix] Avoid many panics that may occur on broken files
-[Bugfix] Fix race condition that may cause tests to fail
-[Performance] Optimizations to unfiltering and copying
-[Feature] Add --ng option to skip grayscale reduction
-[Feature] Also preserve timestamps when using --preserve
-[Misc] Bump crc to 2.x
Oxipng is a multithreaded lossless PNG compression optimizer. It can be used
via a command-line interface or as a library in other Rust programs.
It began as a complete rewrite of the OptiPNG project with the core goal of
implementing multithreading, which would be very difficult to do within the
existing C codebase of OptiPNG.