bumb version

Author: kakopappa

setup.py

@@ -10,7 +10,7 @@
 if sys.version_info < (3,6):
     sys.exit('Sorry, Python < 3.6 is not supported')
 
-VERSION = "2.6.3"
+VERSION = "2.6.4"
 
 with open('README.rst', 'r') as f:
     long_description = f.read()