update classifiers

setup.py

@@ -18,9 +18,11 @@ setup(
     classifiers=[
         'Environment :: Web Environment',
         'Intended Audience :: Developers',
+        'Development Status :: 5 - Production/Stable',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
+        'Programming Language :: Python :: 3',
         'Topic :: Utilities',
     ]
 )