add win 10 classifier

Author: zeaphoo

setup.py

@@ -43,7 +43,7 @@
         'Environment :: Console',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
-        'Operating System :: Windows 10',
+        'Operating System :: Microsoft :: Windows :: Windows 10',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.7',