Merge pull request #793 from Alignak-monitoring/doc-badge

Update badge for doc on repository readme

Author: ddurieux

README.rst

@@ -20,9 +20,9 @@ Presentation of the Alignak project
     :target: http://alignak-doc.readthedocs.org/en/latest/?badge=latest
     :alt: Lastest documentation Status
 
-.. image:: https://readthedocs.org/projects/alignak-doc/badge/?version=update
-    :target: http://alignak-doc.readthedocs.org/en/update/?badge=update
-    :alt: Update processing documentation Status
+.. image:: https://readthedocs.org/projects/alignak-doc/badge/?version=develop
+    :target: http://alignak-doc.readthedocs.org/en/update/?badge=develop
+    :alt: Development branch documentation Status
 
 .. image:: https://img.shields.io/badge/IRC-%23alignak-1e72ff.svg?style=flat
     :target: http://webchat.freenode.net/?channels=%23alignak