Badge the readme so things don't get broken, maybe.

zopefoundation · Dec 1, 2016 · 29e16b1 · 29e16b1
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diff --git a/README.rst b/README.rst
@@ -4,6 +4,10 @@
 .. image:: https://travis-ci.org/zopefoundation/zope.keyreference.png?branch=master
         :target: https://travis-ci.org/zopefoundation/zope.keyreference
 
+.. image:: https://readthedocs.org/projects/zopekeyreference/badge/?version=latest
+         :target: http://zopekeyreference.readthedocs.io/en/latest/?badge=latest
+         :alt: Documentation Status
+
 Object references that support stable comparison and hashes.
 
 Documentation can be found at http://zopekeyreference.readthedocs.io