Revert "support version with ':'"
Revert "support version with ':'"

This reverts commit f1f11ca5b38b20cbc87aa29899801a7f1f5db227.

dgr can support it, but rkt & push spec does not allow it

puckel/dgr,puckel/dgr,nyodas/cnt,nyodas/cnt,wmark/blablacar-dgr,wmark/blablacar-dgr,blablacar/dgr,blablacar/dgr