note mozjpeg settings in docs
note mozjpeg settings in docs

see https://github.com/libvips/libvips/issues/1422

jcupitt/libvips,lovell/libvips,jcupitt/libvips,jcupitt/libvips,jcupitt/libvips,lovell/libvips,lovell/libvips,lovell/libvips