Fix links.

README.rst

@@ -1,18 +1,18 @@
 ``zope.minmax``
 ===============
 
-.. image:: https://pypip.in/version/zope.minmax/badge.svg?style=flat
+.. image:: https://img.shields.io/pypi/v/zope.minmax.svg
     :target: https://pypi.python.org/pypi/zope.minmax/
     :alt: Latest Version
 
 .. image:: https://travis-ci.org/zopefoundation/zope.minmax.png?branch=master
         :target: https://travis-ci.org/zopefoundation/zope.minmax
 
 .. image:: https://readthedocs.org/projects/zopeminmax/badge/?version=latest
-        :target: http://zopeminmax.readthedocs.org/en/latest/
+        :target: http://zopeminmax.readthedocs.io/en/latest/
         :alt: Documentation Status
 
 This package provides support for homogeneous values favoring maximum
 or minimum for ZODB conflict resolution.
 
-See ``src/zope/minmax/minmax.txt`` for a detailed description.
+See http://zopeminmax.readthedocs.io for a detailed description.