The vendor was renamed from `wrm` to `werkraummedia`.
And the namespace vendor was renamed from `Wrm` to `WerkraumMedia`.
That way all references to PHP classes as well as the package name
itself need to be adjusted.
The existing code didn't work with the provided data.
We added a new test case to cover the situation.
We adjusted the existing code to check on the actual rel value instead
of the keys.
