specify Python versions in setup.py

setup.py

@@ -27,6 +27,17 @@ setup(name='tempstorage',
       author='Zope Foundation and Contributors',
       author_email='zope-dev@zope.org',
       long_description=long_description,
+      classifiers=[
+        "Programming Language :: Python",
+        "Programming Language :: Python :: 2",
+        "Programming Language :: Python :: 2.6",
+        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.2",
+        "Programming Language :: Python :: 3.3",
+        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: Implementation :: CPython",
+      ],
       packages=find_packages('src'),
       package_dir={'': 'src'},
       install_requires=[