bump version to 5.6.7

Author: daierji

setup.py

@@ -4,7 +4,7 @@
 import sys
 from setuptools import setup, find_packages
 
-version = '5.6.6'
+version = '5.6.7'
 
 if sys.argv[-1] == 'publish':
     os.system('python setup.py sdist upload')