update version

Author: Cuong Nguyen

setup.py

@@ -1,7 +1,7 @@
 import os
 from setuptools import find_packages, setup
 
-VERSION = '5.0.1'
+VERSION = '5.1.1'
 with open(os.path.join(os.path.dirname(__file__), 'README.rst')) as readme:
     README = readme.read()