imagemin-optipng
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Add option to keep metadata
This PR adds the option to preserve the image metadata. More explanation https://manpages.debian.org/stretch/optipng/optipng.1.en.html
Hey folks, -strip all
causes optipng to break my APNG files, so it would be very nice to be able to turn this off. Would anybody mind if I resubmitted this PR with the changes requested?