Document requirement on patched JJB

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 This repository holds the configuration of the LTTng Jenkins jobs. It is
 meant to be used with Jenkins Job Builder from the OpenStack Foundation.
 
+A patched version of JJB is currently required with this repository, it
+can be installed directly from github :
+
+    $ virtualenv -p python2 .venv
+    $ . .venv/bin/activate
+    $ pip install git+git://github.com/mjeanson/jenkins-job-builder
+
+
 ## Example Usage
 
 Generate XML files for Jenkins jobs from YAML files: