update classifiers

Author: rflamary

setup.py

@@ -78,10 +78,10 @@
         'License :: OSI Approved :: MIT License',
         'Environment :: Console',
         'Operating System :: OS Independent',
-        'Operating System :: Linux',
+        'Operating System :: POSIX :: Linux',
         'Operating System :: MacOS',
         'Operating System :: POSIX',
-        'Operating System :: Windows',
+        'Operating System :: Microsoft :: Windows',
         'Programming Language :: Python',
         'Programming Language :: C++',
         'Programming Language :: C',