[conda] make bob.io. packages test requirements

4 jobs for issue-5-remove-io-dependency in 12 minutes and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #203262
docker
build_linux_36

00:05:24

79.0%
passed #203263
docker
build_linux_37

00:05:17

79.0%
passed #203260
macosx
build_macosx_36

00:12:12

79.0%
passed #203261
macosx
build_macosx_37

00:12:23

79.0%