Add the Python 3 classifier to make distribute visible on the Python 3 packages list on PyPI

--HG--
branch : distribute
extra : rebase_source : c4d4ddf6dce9ae7938bd4c017aa261bf5ceef364

setup.py

@@ -134,6 +134,7 @@ dist = setup(
     License :: OSI Approved :: Zope Public License
     Operating System :: OS Independent
     Programming Language :: Python
+    Programming Language :: Python :: 3
     Topic :: Software Development :: Libraries :: Python Modules
     Topic :: System :: Archiving :: Packaging
     Topic :: System :: Systems Administration