Update websocket-client to 0.48.0

[pyup-bot]

This PR updates websocket-client from 0.47.0 to 0.48.0.

Changelog

0.48.0

- Add NullHandler to logger to fix python 2 issue. (400)
- Fix the issue that websocket status message may not present (403)
- Socket error not raised in nested try except in python2 (408)
- Load system default certificates if none are given (415)
- Fix waiting forever on ping/pong timeout (411)
- socks5 via pysocks support (417)
- v0.47.0 breaks ability to stop stream with `run_forever` (410)
- _http.py: fix windows proxy error due to socktype (427)

Links

• PyPI: https://pypi.org/project/websocket-client
• Changelog: https://pyup.io/changelogs/websocket-client/
• Repo: https://github.com/websocket-client/websocket-client.git