README.md: caption formatting.

README.md

@@ -15,6 +15,7 @@ has been added to web-socket-js to implement WebSocket SSL/TLS
 encryption, i.e. the "wss://" URI scheme.
 
 Running in Chrome before and after connecting:
+
 <img src="http://kanaka.github.com/noVNC/img/noVNC-1.jpg" width=400>&nbsp;<img src="http://kanaka.github.com/noVNC/img/noVNC-2.jpg" width=400>
 
 ### Requirements