Picked this up from d:l:p:misc, needed for new version of onionshare

- Update to 5.0.3
* Document the use of simple-websocket with the development web server (commit)
* Show transport in example apps (commit)
* Added Open Collective funding option (commit)
* Silence deprecation warning from Werkzeug 2.x #1549 (commit)
* Updated server options in documentation (commit)
* Updated socketio javascript client versions in documentation (commit)
* Fix typo in documentation #1524 (commit) (thanks lennertcl!)
* Change room documentation from room= to to= #1519 (commit) (thanks David McInnis!)
* Fixed a type in the Kafka URL in the documentation #1476 (commit) (thanks VVakko!)
* Fixed typos in documentation #1447 (commit)
* Add test_socketio.py from Github repo for testing, because it
is not included into the PyPI sdist anymore.
- conversion to singlespec
update to version 5.0.1