Log Message:
py-websocket-client: updated to 0.48.0

0.48.0:
- Add NullHandler to logger to fix python 2 issue.
- Fix the issue that websocket status message may not present
- Socket error not raised in nested try except in python2
- Load system default certificates if none are given
- Fix waiting forever on ping/pong timeout
- socks5 via pysocks support
- v0.47.0 breaks ability to stop stream with run_forever
- _http.py: fix windows proxy error due to socktype