bump version to 3.1.1

Author: stefankoegl

jsonpointer.py

@@ -32,7 +32,7 @@
 
 # Will be parsed by setup.py to determine package metadata
 __author__ = 'Stefan Kögl <stefan@skoegl.net>'
-__version__ = '3.1.0'
+__version__ = '3.1.1'
 __website__ = 'https://github.com/stefankoegl/python-json-pointer'
 __license__ = 'Modified BSD License'