Tweak classifiers in setup.py

Author: meatballs

setup.py

@@ -55,11 +55,9 @@ def read(*names, **kwargs):
         'License :: OSI Approved :: MIT License',
         'Operating System :: Unix',
         'Operating System :: POSIX',
-        'Operating System :: Microsoft :: Windows',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: Implementation :: CPython',
-        'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Utilities',
     ],
     keywords=[