setup: Declare this module OS-independent

Author: madscientist

setup.py

@@ -47,8 +47,7 @@
         'Environment :: Console',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: BSD License',
-        'Operating System :: MacOS :: MacOS X',
-        'Operating System :: POSIX :: Linux',
+        'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',