message: LOCAL_ADDR is not required for -U
  ref
diff: @@ -58,7 +58,6 @@ pub fn define_command_line_options(mut app: App<'_>) -> App<'_> {
  .arg(
  Arg::new("TCP_AND_UDP")
  .short('U')
  - .requires("LOCAL_ADDR")
  .help("Server mode TCP_AND_UDP"),
  )
  .arg(
  @@ -72,7 +71,6 @@ pub fn define_command_line_options(mut app: App<'_>) -> App<'_> {
  Arg::new("UDP_BIND_ADDR")
  .long("udp-bind-addr")
  .takes_value(true)
  - .requires("LOCAL_ADDR")
  .validator(validator::validate_server_addr)
  .help("UDP relay's bind address, default is the same as local-addr"),
  )
  