Log Message:
Update to 15.4.0:

Twisted Core 15.4.0 (2015-09-04)
================================

Features
--------
 - Trial has been ported to Python 3. (#5965)
 - Twisted now requires setuptools for installation. (#7177)
 - twisted.internet.endpoints.clientFromString is now ported to Python
   3. (#7973)
 - twisted.internet._sslverify now uses SHA256 instead of MD5 for
   certificate request signing by default. (#7979)
 - twisted.internet.endpoints.serverFromString is now ported to Python
   3. (#7982)
 - twisted.positioning is now ported to Python 3. (#7987)
 - twisted.python.failure.Failure's __repr__ now includes the
   exception message. (#8004)

Bugfixes
--------
 - fixed a bug which could lead to a hang at shutdown in
   twisted.python.threadpool. (#2673)
 - twisted.internet.kqreactor on Python 3 now supports EINTR
   (Control-C) gracefully. (#7887)
 - Fix a bug introduced in 15.3.0; pickling a lambda function after
   importing twisted.persisted.styles raises PicklingError rather than
   AttributeError. (#7989)

Other
-----
 - #7902, #7980, #7990, #7992

Twisted Web 15.4.0 (2015-09-04)
===============================

Features
--------
 - twisted.web.proxy is now ported to Python 3. (#7939)
 - twisted.web.guard is now ported to Python 3. (#7974)

Bugfixes
--------
 - twisted.web.http.Request.setResponseCode now only allows bytes
   messages. (#7981)
 - twisted.web.server.Request.processingFailed will now correctly
   write out the traceback on Python 3. (#7996)