Log Message:
py-websocket-client: updated to 0.58.0

0.58.0
- Fix README typos
- Create README.md from README.rst
- Capitalize 'Upgrade' in 'Connection: Upgrade'
- Add Python 3.8 and 3.9 CI support
- Replace deprecated `thread.isAlive` with `thread.is_alive`
- Revert to LGPL v2.1 license
- Add code coverage CI testing
- Properly revert callback
- Replace TravisCI with GitHub Actions
- Create Sphinx readthedocs.io documentation