specify version to bootstrap, in does not work without it

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34930 20353a03-c40f-0410-a6d1-a30d3c3de9de

buildout/README-2.12.txt

@@ -37,7 +37,7 @@ For example:
 Run the Zope 2.12 buildout:
 
   $ cd ~/erp5.buildout
-  $ python2.6 bootstrap/bootstrap.py
+  $ python2.6 bootstrap/bootstrap.py -v 1.4.3
   $ bin/buildout -v -c buildout-2.12.cfg
 
 This will download and install the software components needed to run ERP5 on