Make upgrade check for SPDX license string (#131)
Make upgrade check for SPDX license string (#131)

The project license can be any valid SPDX license string, so instead of
checking for a single license, the upgrade command should treat e.g.,
dual licenses as valid.
ximion/appstream-glib,ximion/appstream-glib,ximion/appstream-glib,hughsie/appstream-glib,hughsie/appstream-glib,hughsie/appstream-glib