Bump typing_extensions version before release (python#558)

Author: ilevkivskyi

setup.py

@@ -9,7 +9,7 @@
                      'to install the typing package.\n')
     exit(1)
 
-version = '3.6.2.1'
+version = '3.6.5'
 description = 'Backported and Experimental Type Hints for Python 3.5+'
 long_description = '''\
 Typing Extensions -- Backported and Experimental Type Hints for Python