Add Travis badge.

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diff --git a/README.rst b/README.rst
index e00c09d..80b2ebb 100644
--- a/README.rst
+++ b/README.rst
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 ``zope.interface`` README
 =========================
 
+.. image:: https://travis-ci.org/zopefoundation/zope.interface.png?branch=master
+        :target: https://travis-ci.org/zopefoundation/zope.interface
+
 This package is intended to be independently reusable in any Python
 project. It is maintained by the `Zope Toolkit project
 <http://docs.zope.org/zopetoolkit/>`_.