Add testing for pypy3

.travis.yml

@@ -5,6 +5,7 @@ env: # These should match the tox env list
     - TOXENV=py33
     - TOXENV=py34
     - TOXENV=pypy
+    - TOXENV=pypy3
 install: pip install coveralls tox --use-mirrors
 script: tox
 after_success:

setup.py

@@ -14,10 +14,13 @@ setup(
     platforms='linux',
     classifiers=[
         'License :: OSI Approved :: MIT License',
+        'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
     ],
 

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 project = pre_commit_hooks
 # These should match the travis env list
-envlist = py26,py27,py33,py34,pypy
+envlist = py26,py27,py33,py34,pypy,pypy3
 
 [testenv]
 install_command = pip install --use-wheel {opts} {packages}