added 3.7 classifier

Author: zopyx

setup.py

@@ -9,10 +9,9 @@
     'Operating System :: OS Independent',
     'Programming Language :: Python',
     'Programming Language :: Python :: 2.7',
-    'Programming Language :: Python :: 3.3',
-    'Programming Language :: Python :: 3.4',
     'Programming Language :: Python :: 3.5',
     'Programming Language :: Python :: 3.6',
+    'Programming Language :: Python :: 3.7',
     'Topic :: System :: Filesystems',
 ]