fix Gifsicle#init options argument to be {} by default
fix Gifsicle#init options argument to be {} by default

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