[README] Add label for latest release

README.md

@@ -1,6 +1,8 @@
 rss-bridge
 ===
-[![LICENSE](https://img.shields.io/badge/license-UNLICENSE-blue.svg)](UNLICENSE) [![Build Status](https://travis-ci.org/RSS-Bridge/rss-bridge.svg?branch=master)](https://travis-ci.org/RSS-Bridge/rss-bridge)
+[![LICENSE](https://img.shields.io/badge/license-UNLICENSE-blue.svg)](UNLICENSE) 
+[![Build Status](https://travis-ci.org/RSS-Bridge/rss-bridge.svg?branch=master)](https://travis-ci.org/RSS-Bridge/rss-bridge) 
+[![GitHub release](https://img.shields.io/github/release/rss-bridge/rss-bridge.svg)](https://github.com/rss-bridge/rss-bridge/releases/latest)
 
 rss-bridge is a PHP project capable of generating ATOM feeds for websites which don't have one.