Add Coverity Badge

README.md

@@ -16,6 +16,7 @@
 
 [![Join the chat at https://gitter.im/visualboyadvance-m/Lobby](https://badges.gitter.im/visualboyadvance-m/Lobby.svg)](https://gitter.im/visualboyadvance-m/Lobby)
 [![Build Status](https://travis-ci.org/visualboyadvance-m/visualboyadvance-m.svg?branch=master)](https://travis-ci.org/visualboyadvance-m/visualboyadvance-m)
+[![Coverity Scan Build Status](https://scan.coverity.com/projects/16096/badge.svg)](https://scan.coverity.com/projects/visualboyadvance-m-visualboyadvance-m)
 
 # Visual Boy Advance - M