updated instructions for jpegoptim to v1.4.0
updated instructions for jpegoptim to v1.4.0
mihailim/image_optim,weheartit/image_optim,ramiroaraujo/image_optim,mihailim/image_optim,mihailim/image_optim,toy/image_optim,toy/image_optim,weheartit/image_optim,ramiroaraujo/image_optim,toy/image_optim,weheartit/image_optim,ramiroaraujo/image_optim