Fixed README.

README.rst

@@ -1,8 +1,15 @@
 Introduction
 ============
 
-This package makes it possible to use `zope.intid` (and
-consequentially other packages that rely on it such as
-``zope.keyreference``) in a Zope2 environment.
+Make it possible to use `zope.intid`_  in a Zope environment. 
+This includes other packages that rely on it such as `zope.keyreference`_
 
-.. _zope.intid: http://pypi.python.org/pypi/zope.intid
+.. _zope.intid: https://pypi.python.org/pypi/zope.intid
+.. _zope.keyreference: https://pypi.python.org/pypi/zope.keyreference
+
+Source Code
+===========
+
+Contributors please read the document `Process for Plone core's development <https://docs.plone.org/develop/coredev/docs/index.html>`_
+
+Sources are at the `Plone code repository hosted at Github <https://github.com/plone/five.intid>`_.