update readme.

 simple-rtmp-server
 ==================
 
-simple rtmp origin live server over state-threads, which can be used as origin server, or rtmp-server for encoder.<br/>
-srs is a simple, high-performance, running in single process, origin live server, support vhost.<br/>
+simple rtmp origin live server over state-threads.<br/>
+srs is a simple, high-performance, running in single process, origin live server.<br/>
 blog: [http://blog.csdn.net/win_lin](http://blog.csdn.net/win_lin) <br/>
 see also: [https://github.com/winlinvip/simple-rtmp-server](https://github.com/winlinvip/simple-rtmp-server) <br/>
 see also: [http://winlinvip.github.io/simple-rtmp-server](http://winlinvip.github.io/simple-rtmp-server)