Return DynamicImage instead of RgbImage and bump to 0.2.1

4 jobs for master in 12 minutes and 53 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build_examples #173
docker notoaster

00:03:08

passed build_lib #172
docker notoaster

00:02:55

 
  Test
passed example:download_images #175
docker notoaster

00:03:53

passed example:dump #174
docker notoaster

00:02:55