compilation fails

use this command : go get -u github.com/riobard/go-shadowsocks2 attention the github link
the error message : go/src/github.com/riobard/go-shadowsocks2/tcp_linux.go:36: c.SyscallConn undefined (type *net.TCPConn has no field or method SyscallConn)

go-shadowsocks2/tcp_linux.go

Lines 30 to 39 in 3bf6ca0

    
           func getOrigDst(conn net.Conn, ipv6 bool) (socks.Addr, error) { 
        
           	c, ok := conn.(*net.TCPConn) 
        
           	if !ok { 
        
           		return nil, errors.New("only work with TCP connection") 
        
           	} 
        
           	rc, err := c.SyscallConn() 
        
           	if err != nil { 
        
           		return nil, err 
        
           	}

but, use use this command : go get -u github.com/shadowsocks/go-shadowsocks2
Installation is successful.
https://github.com/shadowsocks/go-shadowsocks2/blob/90a5b4a50462fbbb14262f386251f056a8678a20/tcp_linux.go#L30-L39

I think the reason is go-version, can you compatible with the old version? like go 1.8

This repo is experimental and it requires latest Go (currently >= 1.10). The stable repo at (https://github.com/shadowsocks/go-shadowsocks2) is more compatible with older Go versions. If you have to use older Go, please consider the stable repo instead.

	func getOrigDst(conn net.Conn, ipv6 bool) (socks.Addr, error) {
	c, ok := conn.(*net.TCPConn)
	if !ok {
	return nil, errors.New("only work with TCP connection")
	}

	rc, err := c.SyscallConn()
	if err != nil {
	return nil, err
	}