message: [dev] update help text to 127.0.0.1
diff: @@ -516,7 +516,7 @@ fn run() -> Result<(), failure::Error> {
  )
  .arg(
  Arg::with_name("ip")
  - .help("ip to listen on. defaults to localhost")
  + .help("ip to listen on. defaults to 127.0.0.1")
  .short("i")
  .long("ip")
  .takes_value(true)
  