update readme.

@@ -721,7 +721,7 @@ The play benchmark by [st-load](https://github.com/winlinvip/st-load):
 * 2014-11-12, SRS 2.0.14,  2.7k(2700)clients, 69%CPU, 59MB.
 * 2014-11-12, SRS 2.0.14,  3.5k(3500)clients, 95%CPU, 78MB. [commit](https://github.com/winlinvip/simple-rtmp-server/commit/8acd143a7a152885b815999162660fd4e7a3f247)
 * 2014-11-13, SRS 2.0.15,  6.0k(6000)clients, 82%CPU, 203MB. [commit](https://github.com/winlinvip/simple-rtmp-server/commit/cc6aca9ad55342a06440ce7f3b38453776b2b2d1)
-* 2014-11-22, SRS 2.0.30,  7.5k(7500)clients, 87%CPU, 320MB.
+* 2014-11-22, SRS 2.0.30,  7.5k(7500)clients, 87%CPU, 320MB. [commit](https://github.com/winlinvip/simple-rtmp-server/commit/58136ec178e3d47db6c90a59875d7e40946936e5)
 
 ### Publish benchmark