update the python version in the setup.py

Author: garaud

setup.py

@@ -25,6 +25,10 @@
       maintainer="Todd Lipcon",
       maintainer_email="[email protected]",
       description="""Cyrus-SASL bindings for Python""",
+      classifiers=[
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 3',
+      ],
       packages=['sasl'],
       install_requires=['six'],
       ext_modules=[sasl_module],