update readme

@@ -54,7 +54,7 @@ m3u8 url: http://127.0.0.1:80/live/livestream.m3u8
 15. [plan] support full http callback api.<br/>
 16. [plan] support network based cli and json result.<br/>
 17. [plan] support bandwidth test api and flash client.<br/>
-18. [plan] support adobe flash swf verification.<br/>
+18. [plan] support adobe flash refer/token/swf verification.<br/>
 19. [plan] support adobe amf3 codec.<br/>
 20. no edge server, origin server only.<br/>
 21. no vod streaming, live streaming only.<br/>