Log Message:
Changes 12.0.0:
Features
--------
 - The interface argument to IReactorTCP.listenTCP may now be an IPv6
   address literal, allowing the creation of IPv6 TCP servers.
 - twisted.python.constants.Names now provides a way to define
   collections of named constants, similar to the "enum type" feature
   of C or Java.
 - twisted.python.constants.Values now provides a way to define
   collections of named constants with arbitrary values.

Bugfixes
--------
 - Fixed an obscure case where connectionLost wasn't called on the
   protocol when using half-close.
 - UDP ports handle socket errors better on Windows.
 - When idle, the gtk2 and glib2 reactors no longer wake up 10 times a
   second.
 - Prevent a rare situation involving TLS transports, where a producer
   may be erroneously left unpaused.
 - twisted.internet.iocpreactor.iocpsupport now has fewer 64-bit
   compile warnings.
 - The GTK2 reactor is now more responsive on Windows.
 - TLS transports now correctly handle producer registration after the
   connection has been lost.
 - twisted.protocols.htb.Bucket now empties properly with a non-zero
   drip rate.
 - IReactorSSL and ITCPTransport.startTLS now synchronously propagate
   errors from the getContext method of context factories, instead of
   being capturing them and logging them as unhandled.

Improved Documentation
----------------------
 - The multicast documentation has been expanded.
 - twisted.internet.defer.Deferred now documents more return values.
 - Show a better starting page at
   http://twistedmatrix.com/documents/current

Deprecations and Removals
-------------------------
 - Remove the deprecated module twisted.enterprise.reflector.
 - Removed the deprecated module twisted.enterprise.row.
 - Remove the deprecated module twisted.enterprise.sqlreflector.
 - Removed the deprecated module twisted.enterprise.util, as well as
   twisted.enterprise.adbapi.safe.
 - Python 2.4 is no longer supported on any platform.
 - Removed printTraceback and noOperation from twisted.spread.pb,
   deprecated since Twisted 8.2.