Update README.md

README.md

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 [简体中文](/doc/README.zh-cn.md)
 
 ###### Note
-You can use udp2raw with UDPspeeder together to avoid UDP being blocked or being throttled.
+You can use udp2raw with UDPspeeder together to bypass UDP firewalls.
 udp2raw：https://github.com/wangyu-/udp2raw-tunnel