Can you build urllib3 in rawhide and f29?.
urllib3 is built for rawhide and f29, it looks like your problem is because it's version 1.24.1:
The 'urllib3<1.24' distribution was not found and is required by transifex-client
If upstream isn't compatible with 1.24 (which I don't think is likely, since it didn't have any intentional backwards-incompatible changes) they'll need to fix that. If they are compatible, they need to fix their dependencies in setup.py by bumping the version up to 1.25 or unpinning it entirely.
You can write a patch to do that, send it upstream, and also apply it in your specfile. I often have to do this with requests.