from aiohttp import Response raises an ImportError.
Build is green
See https://jenkins.softwareheritage.org/job/DCORE/job/tox/268/ for more details.
I'm not sure about this back and forth... This was added not so long ago... See D1688
Might be discuss this with @douardda when he gets back
A smaller change would be importing Response from aiohttp.web instead of just aiohttp.
In that case it'd be nice to add a test for this code path.