add flags to end instead of beginning of command in pngcrush worker
add flags to end instead of beginning of command in pngcrush worker
weheartit/image_optim,mihailim/image_optim,ramiroaraujo/image_optim,ramiroaraujo/image_optim,toy/image_optim,mihailim/image_optim,weheartit/image_optim,ramiroaraujo/image_optim,toy/image_optim,mihailim/image_optim,toy/image_optim,weheartit/image_optim