Merge branch 'master' of https://github.com/xtaci/kcptun

Merge branch 'master' of https://github.com/xtaci/kcptun

Update README.en.md

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

add -log option to redirect log , see issue xtaci#199

block-waiting for a connection after the client has been started