API to set visibility_level for groups is missing
There is GET /api/v3/groups/:id
to read the visibility_level
for a given group, but there's no PUT
method defined to actually set it (like there already is for projects). Since we want to switch all groups/projects from private to internal now that there is the new "external user" feature, I would have to change all of our groups by hand, which is not something I'm looking forward too...