A test would be nice but I'm unfamiliar with this repo. Do we have tests
for this package?
https://codereview.appspot.com/6922050/diff/2002/proxy/socks5.go
File proxy/socks5.go (right):
https://codereview.appspot.com/6922050/diff/2002/proxy/socks5.go#newcode147
proxy/socks5.go:147: buf = append(buf, []byte(ipv4)...)
ip = ipv4
and then the append can be done below where it used to be.
Also the []byte() conversion is not necessary (I know it was in the
original).
https://codereview.appspot.com/6922050/
