Add dev-requirements for needed packages
Add dev-requirements for needed packages

Install stuff with either `pip install -r dev-requirements.txt` or,
`pip wheel -r dev-requirements.txt` and
`pip install -f ./wheelhouse/ -r dev-requirements.txt`

fobdy/flask-uwsgi-websocket,zeekay/flask-uwsgi-websocket,Ivoz/flask-uwsgi-websocket,stepheny/flask-uwsgi-websocket