www/py-websocket-client: Update to 0.56.0

[koobs]

Summary

Required to update www/py-praw (websocket-client>=0.54.0.0)

www/py-websocket-client: Update to 0.56.0

  - Update LICENSE [1]
  - Update pkg-descr, add WWW: URL
  - Add USE_PYTHON=concurrent, package installs a script
  - Remove backports.ssl_match_hostname dependency, only needed for
    Python < 2.7.9 [2]

Changelog:

  https://github.com/websocket-client/websocket-client/blob/v0.56.0/ChangeLog

[1] https://github.com/websocket-client/websocket-client/commit/e94ed9e078c7772a7dc0a115da1a34c493f290b6
[2] https://github.com/websocket-client/websocket-client/commit/f7f5f70681c621d169b82fc842cb2396265203d5

Reviewed_by: alfred (maintainer)
Approved by: alfred (maintainer)
Differential_Revision: D20283

Test Plan

• portlint: OK (portlint: WARNING using hyphen in PORTNAME)
• testport: OK (poudriere: 12amd64{py27,py36})
• maketest: Ran 32 tests in 0.094s OK (skipped=10)

[alfred]