Update README.rst

Fix documentation link.

README.rst

@@ -12,7 +12,7 @@ Django REST framework
 
 **Important!** REST framework 2.0 is due to be released to PyPI by the end of October.
 If you are considering building a new API using REST framework you should start working
-with the `restframework2` branch, and refering to the upcoming `REST framework 2 docs <tomchristie.github.com/django-rest-framework>`_.
+with the `restframework2` branch, and refering to the upcoming `REST framework 2 docs <http://tomchristie.github.com/django-rest-framework>`_.
 
 Overview
 ========