Fix classifier

Author: Stephen McMillen

setup.py

@@ -21,7 +21,7 @@
         'Environment :: Web Environment',
         'Intended Audience :: End Users/Desktop',
         'Intended Audience :: Developers',
-        'Operating System :: ',
+        'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Topic :: Internet',
         'Topic :: Multimedia :: Video',