Test against multiple version of six.  We have an old version on epel7.
Test against multiple version of six.  We have an old version on epel7.

Ghost-script/fedmsg_meta_fedora_infrastructure,fedora-infra/fedmsg_meta_fedora_infrastructure,sayanchowdhury/fedmsg_meta_fedora_infrastructure,opoplawski/fedmsg_meta_fedora_infrastructure