Add PyPI and RTD badges.

README.rst

@@ -1,7 +1,15 @@
 ``zope.location``
 =================
 
+.. image:: https://pypip.in/version/zope.location/badge.svg?style=flat
+    :target: https://pypi.python.org/pypi/zope.location/
+    :alt: Latest Version
+
 .. image:: https://travis-ci.org/zopefoundation/zope.location.png?branch=master
         :target: https://travis-ci.org/zopefoundation/zope.location
 
+.. image:: https://readthedocs.org/projects/zopelocation/badge/?version=latest
+        :target: http://zopelocation.readthedocs.org/en/latest/
+        :alt: Documentation Status
+
 In Zope3, "locations" are special objects that have a structural location.