bash-completion: allow install/uninstall xml.gz
bash-completion: allow install/uninstall xml.gz

Signed-off-by: Igor Gnatenko <c869b0bfe2cf1da26c2efd33f6d6d74ddcbbdd2b@gmail.com>

ximion/appstream-glib,ikeydoherty/appstream-glib,mitya57/appstream-glib,ikeydoherty/appstream-glib,hughsie/appstream-glib,superm1/appstream-glib,hughsie/appstream-glib,mitya57/appstream-glib,kalev/appstream-glib,kalev/appstream-glib,ximion/appstream-glib,superm1/appstream-glib,hughsie/appstream-glib,ximion/appstream-glib