v0.2.2

• Limit number of threads to 1.5x number of cores
• Significantly improve memory usage, especially with high optimization levels. (#32)
• Refactor output code (#19)

v0.2.1

• Add rustdoc for public methods and structs
• Improve filter mode 5 heuristic (#16)
• Add tests for edge-case images with subtitles (#29)

v0.2.0

• Fix program version that is displayed when running oxipng -V
• Ensure --quiet mode is actually quiet (@SethDusek #20)
• Write status/debug information to stderr instead of stdout
• Use heuristics to determine best combination for -o1 (#21)
• [SEMVER_MAJOR] Allow 'safe', 'all', or comma-separated list as options for --strip
• [SEMVER_MINOR] Add -s alias for --strip

v0.1.1

• Fix oxipng * writing all input files to one output file (#15)

v0.1.0

• Initial beta release
• Reduce color type and bit depth
• Recompress with zlib
• Multithreading
• Strip headers option
• Backup file before writing option
• Write to stdout option