Update README.md

README.md

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 # Udp2raw-tunnel
 ![image0](images/image0.PNG)
 
-An Encrpyted,Anti-Replay,Multiplexed Udp Tunnel,tunnels udp traffic through raw socket
+An Encrpyted,Anti-Replay,Multiplexed Udp Tunnel,tunnels udp traffic through fake-tcp or icmp by using raw socket
 
 [简体中文](/doc/README.zh-cn.md)
 ### Send/Recv Udp Packet as Raw Packet with TCP header,ICMP header