update readme, update latest release binaries

README.md

@@ -1,10 +1,10 @@
 #Simple-RTMP-Server
 
 下载发布版(github): 
-[Centos6-x86_64](http://winlinvip.github.io/srs.release/releases/files/SRS-CentOS6-x86_64-0.9.55.zip) 
+[Centos6-x86_64](http://winlinvip.github.io/srs.release/releases/files/SRS-CentOS6-x86_64-0.9.79.zip) 
 其他[more...](http://winlinvip.github.io/srs.release/releases/) <br/>
 下载发布版(国内阿里云镜像): 
-[Centos6-x86_64](http://demo.chnvideo.com:8085/srs/releases/files/SRS-CentOS6-x86_64-0.9.55.zip) 
+[Centos6-x86_64](http://demo.chnvideo.com:8085/srs/releases/files/SRS-CentOS6-x86_64-0.9.79.zip) 
 其他[more...](http://demo.chnvideo.com:8085/srs/releases/)<br/>
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