Looks like LabalParam is adding a 'state' param rather than a 'label'.
https://github.com/47deg/github4s/blob/b166c8706999191e67128f09744793070811c905/github4s/shared/src/main/scala/github4s/free/domain/SearchParam.scala#L70-L71
I am pretty new to this whole Scala thing, so I am not sure how this should be tested, but I'll update the PR with any suggestions.