add requirement python-netaddr

README.md

@@ -5,11 +5,10 @@ Install and configure a kubernetes cluster including network plugin.
 
 ### Requirements
 Tested on **Debian Wheezy/Jessie** and **Ubuntu** (14.10, 15.04, 15.10).
-Should work on RedHat/Fedora/Centos plateforms (to be tested)
+Should work on **RedHat/Fedora/Centos** platforms (to be tested)
 * The target servers must have access to the Internet in order to pull docker imaqes.
 * The firewalls are not managed, you'll need to implement your own rules the way you used to.
-
-Ansible v1.9.x
+* Ansible v1.9.x and python-netaddr
 
 ### Components
 * [kubernetes](https://github.com/kubernetes/kubernetes/releases) v1.1.3