Add support for PyPy3.

CHANGES.rst

@@ -4,12 +4,14 @@ Changes
 1.4.4 (unreleased)
 ------------------
 
-- Adde 100% branch coverage (in addition to 100% statement coverage).
+- Add support for PyPy3.
+
+- Require 100% branch coverage (in addition to 100% statement coverage).
 
 1.4.3 (2014-03-20)
 ------------------
 
-- Added support for Python 3.4.
+- Add support for Python 3.4.
 
 1.4.2 (skipped)
 ---------------

tox.ini

@@ -3,7 +3,7 @@ envlist =
 # Jython support pending 2.7 support, due 2012-07-15 or so.  See:
 # http://fwierzbicki.blogspot.com/2012/03/adconion-to-fund-jython-27.html
 #    py26,py27,py32,pypy,jython,coverage
-    py26,py27,py32,py33,py34,pypy,coverage,docs
+    py26,py27,pypy,py32,py33,py34,pypy3,coverage,docs
 
 [testenv]
 commands =