Websocket-client

- Fix broken run_forever() functionality (769)

- Migrate wsdump script in setup.py from scripts to newer entry_points (763)
- Add support for ssl.SSLContext for arbitrary SSL parameters (762)
- Remove keep_running variable (752)
- Remove HAVE_CONTEXT_CHECK_HOSTNAME variable (dac1692)
- Replace deprecated ssl.PROTOCOL_TLS with ssl.PROTOCOL_TLS_CLIENT (760)
- Simplify code and improve Python 3 support (751, 750, 746)
- Fill default license template fields (748)
- Update CI tests
- Improve documentation (732, 733, 734, 737, 766, 768)

- Fix python-socks dependency issue mentioned in 728
- Replace echo.websocket.org with a local websockets echo server for unit tests (4951de2)

- Fix 697, 665: Transition from LGPL 2.1 license to Apache 2.0 license
- Revert 417 and reimplement SOCKS proxy support with python-socks instead of PySocks (fbcbd43)

- Fix 377: increase exception verbosity in _app.py callback exception
- Fix 717: race condition during connection close
- Fix 722: improve handling where credentials include symbols like
- Fix 711: improve handling if ssl is None

- Set enable_multithread to True by default (beb135a)
- Performance improvement in _mask() function (287970e, 433)
- Performance improvement in recv_strict() function (60e4711, 255)
- Performance improvement by removing numpy-related code (a462d45)
- Support uppercase no_proxy, http_proxy, https_proxy env vars (150df4f, 700)
- Add sslopt 'server_hostname' support (698)
- Replace deprecated ssl.PROTOCOL_SSLv23 with ssl.PROTOCOL_TLS (494564f)
- Update documentation, README (7c9d604, 704)