Add PyPI and RTD badges.

README.rst

@@ -1,9 +1,17 @@
 ``zope.dublincore``
 ===================
 
+.. image:: https://pypip.in/version/zope.dublincore/badge.svg?style=flat
+    :target: https://pypi.python.org/pypi/zope.dublincore/
+    :alt: Latest Version
+
 .. image:: https://travis-ci.org/zopefoundation/zope.dublincore.png?branch=master
         :target: https://travis-ci.org/zopefoundation/zope.dublincore
 
+.. image:: https://readthedocs.org/projects/zopedublincore/badge/?version=latest
+        :target: http://zopedublincore.readthedocs.org/en/latest/
+        :alt: Documentation Status
+
 This package provides a Dublin Core support for Zope-based web
 applications.  This includes: