add depfu status badge instead of removed gemnasium badge
add depfu status badge instead of removed gemnasium badge

ramiroaraujo/image_optim,mihailim/image_optim,toy/image_optim,mihailim/image_optim,ramiroaraujo/image_optim,toy/image_optim,toy/image_optim,mihailim/image_optim,ramiroaraujo/image_optim