Support Python 3.

setup.cfg

@@ -0,0 +1,5 @@
+[bdist_wheel]
+# This flag says that the code is written to work on both Python 2 and Python
+# 3. If at all possible, it is good practice to do this. If you cannot, you
+# will need to generate wheels for each Python version that you support.
+universal=1

setup.py

@@ -58,8 +58,15 @@ def get_version():
     cmdclass={'release': release},
     classifiers=[
         'License :: OSI Approved :: BSD License',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: Implementation :: PyPy',
         'Operating System :: OS Independent',
-        'Programming Language :: Python',
         'Development Status :: 4 - Beta',
         'Intended Audience :: Developers',
         'Intended Audience :: System Administrators',