Add PyPI and RTD badges.

README.rst

@@ -1,9 +1,17 @@
 ``zope.deferredimport``
 =======================
 
+.. image:: https://pypip.in/version/zope.deferredimport/badge.svg?style=flat
+    :target: https://pypi.python.org/pypi/zope.deferredimport/
+    :alt: Latest Version
+
 .. image:: https://travis-ci.org/zopefoundation/zope.deferredimport.png?branch=master
         :target: https://travis-ci.org/zopefoundation/zope.deferredimport
 
+.. image:: https://readthedocs.org/projects/zopedeferredimport/badge/?version=latest
+        :target: http://zopedeferredimport.readthedocs.org/en/latest/
+        :alt: Documentation Status
+
 Often, especially for package modules, you want to import names for
 convenience, but not actually perform the imports until necessary.
 The zope.deferredimport package provided facilities for defining names