include additional requirements

README.md

@@ -20,6 +20,15 @@ you can install it with:
 pip install jmespath
 ```
 
+A recent version of Jinja (2.8) is also required. You can install it with:
+```
+pip install jinja2
+```
+
+If your control node runs on RHEL7, you can run 
+[this playbook](https://github.com/nmasse-itix/OpenShift-Lab/blob/master/common/verify-local-requirements.yml)
+to install the missing dependencies. 
+
 ## Example: Deploy an API on 3scale SaaS with hosted APIcast gateways
 
 If you want to deploy the classic "Echo API" on a SaaS 3scale instance using API Keys,