update reference to special bootstrap script

README.rst

@@ -4,7 +4,7 @@ Buildout
 
 *Note*: the 1.4.4 release is a release for people who encounter trouble
 with the 1.5 line.  By switching to `the associated bootstrap script
-<http://svn.zope.org/repos/main/zc.buildout/branches/1.4/bootstrap/bootstrap.py>`_
+<https://raw.github.com/buildout/buildout/master/bootstrap/bootstrap.py>`_
 you can stay on 1.4.4 until you are ready to migrate.
 
 .. contents::