PNG file optimizer

Current versions

Formula history

Zhiming Wang optipng: fix on 10.13 (#15419)
Miguel Araújo optipng: fix audit --warning
Mike McQuaid Use hash rockets again. (#5177)
Mike McQuaid Use Ruby 1.9+ symbol hash keys in all formulae. (#4942)
Kyungdahm Yun optipng 0.7.6
Viktor Szakats optipng: use secure url in comment
Tomasz Pajor optipng: audit fixes
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages
Xu Cheng optipng: add test
Xu Cheng optipng: modernize
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