Updated py-cheroot to 5.7.0.

v5.7.0
======

- CI improvements:
  * Don't run tests during deploy stage
  * Use VM based build job env only for pyenv envs
  * Opt-in for beta trusty image @ Travis CI
  * Be verbose when running tests (show test names)
  * Show xfail/skip details during test run

- #34: Fix ``_handle_no_ssl`` error handler calls

- #21: Fix ``test_conn`` tests:
  * Improve setup_server def in HTTP connection tests
  * Fix HTTP streaming tests
  * Fix HTTP/1.1 pipelining test under Python 3
  * Fix ``test_readall_or_close`` test
  * Fix ``test_No_Message_Body``
  * Clarify ``test_598`` fail reason

- #36: Add GitHub templates for PR, issue && contributing

- #27: Default HTTP Server header to Cheroot version str

- Cleanup _compat functions from server module

v5.6.0
======

- Fix all PEP 257 related errors in all non-test modules.

  ``cheroot/test/*`` folder is only one left allowed to fail with this linter.

- #30: Optimize chunked body reader loop by returning empty data is the size is 0.

  Ref: cherrypy/cherrypy#1602

- Reset buffer if the body size is unknown

  Ref: cherrypy/cherrypy#1486

- Add missing size hint to SizeCheckWrapper

  Ref: cherrypy/cherrypy#1131

v5.5.2
======

- #32: Ignore "unknown error" and "https proxy request" SSL errors.

  Ref: sabnzbd/sabnzbd#820

  Ref: sabnzbd/sabnzbd#860

v5.5.1
======

- Make Appveyor list separate tests in corresponding tab.

- #29: Configure Travis CI build stages.

  Prioritize tests by stages.

  Move deploy stage to be run very last after all other stages finish.

- #31: Ignore "Protocol wrong type for socket" (EPROTOTYPE) @ OSX for non-blocking sockets.

  This was originally fixed for regular sockets in cherrypy/cherrypy#1392.

  Ref: https://forums.sabnzbd.org/viewtopic.php?f=2&t=22728&p=112251

v5.5.0
======

- #17 via #25: Instead of a read_headers function, cheroot now
  supplies a HeaderReader class to perform the same function.

  Any HTTPRequest object may override the header_reader attribute
  to customize the handling of incoming headers.

  The server module also presents a provisional implementation of
  a DropUnderscoreHeaderReader that will exclude any headers
  containing an underscore. It remains an exercise for the
  implementer to demonstrate how this functionality might be
  employed in a server such as CherryPy.

- #26: Configured TravisCI to run tests under OS X.


(wiz)