bump version to 5.1.1

Author: boegel

setup.py

@@ -36,7 +36,7 @@
 
 # note: release candidates should be versioned as a pre-release, e.g. "1.1rc1"
 # 1.1-rc1 would indicate a post-release, i.e., and update of 1.1, so beware
-VERSION = '5.1.0'
+VERSION = '5.1.1'
 
 
 # Utility function to read README file