disable limit/restriction by default

supress compile warning

update help page

fix last commit

sync UDPspeeder

Update README.zh-cn.md

Merge branch 'master' of https://github.com/wangyu-/tinyFecVPN

Merge branch 'master' of https://github.com/wangyu-/tinyFecVPN

Merge branch 'master' of https://github.com/wangyu-/tinyFecVPN

keep alive fix