add release version badge

README.md

@@ -2,7 +2,7 @@
 
 > Optimize publication workflows by using WordPress as your print CMS.  Eight Day Week provides a set of tools to manage your print workflow directly in your WordPress dashboard–right where your posts are!  Primarily, it offers an interface to group, label, and manage the workflow status of posts in a printed "Issue".
 
-[![Support Level](https://img.shields.io/badge/support-active-green.svg)](#support-level) ![WordPress tested up to version](https://img.shields.io/badge/WordPress-v4.4%20tested-success.svg) [![GPLv2 License](https://img.shields.io/github/license/10up/eight-day-week.svg)](https://github.com/10up/eight-day-week/blob/develop/LICENSE.md)
+[![Support Level](https://img.shields.io/badge/support-active-green.svg)](#support-level) [![Release Version](https://img.shields.io/github/release/10up/eight-day-week.svg)](https://github.com/10up/eight-day-week/releases/latest) ![WordPress tested up to version](https://img.shields.io/badge/WordPress-v4.4%20tested-success.svg) [![GPLv2 License](https://img.shields.io/github/license/10up/eight-day-week.svg)](https://github.com/10up/eight-day-week/blob/develop/LICENSE.md)
 
 ## Table of Contents  
 * [Features](#features)