fix issue when upstream struct change

main.go

@@ -77,10 +77,8 @@ func forward(ctx context.Context, c net.Conn, data []byte, dst string) {
 			Version:           1,
 			Command:           proxyproto.PROXY,
 			TransportProtocol: proxyproto.TCPv4,
-			SourceAddress:      raddr.IP.To4(),
-			DestinationAddress: net.IP{0, 0, 0, 0},
-			SourcePort:         uint16(raddr.Port),
-			DestinationPort:    0,
+			SourceAddr:        raddr,
+			DestinationAddr:   &net.TCPAddr{},
 		}
 
 		switch strings.ToLower(ss[1]) {