update readme, update the st-load

@@ -185,7 +185,7 @@ usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw
 * nginx v1.5.0: 139524 lines <br/>
 
 ### History
-* v0.8, 2013-12-07, update http/hls/rtmp load test tool [st_load](https://github.com/winlinvip/st-load).
+* v0.8, 2013-12-07, update http/hls/rtmp load tool [st_load](https://github.com/winlinvip/st-load), use srs rtmp sdk.
 * v0.8, 2013-12-06, support max_connections, drop if exceed.
 * v0.8, 2013-12-05, support log_dir, write ffmpeg log to file.
 * v0.8, 2013-12-05, fix the forward/hls/encoder bug.