message: correct note on quotes around timestamp
diff: @@ -237,8 +237,8 @@ pub(super) mod timestamp {
  const ARG_NAME: &str = "timestamp";
  const ARG_VALUE_NAME: &str = "TIMESTAMP";
  const ARG_HELP: &str =
  - "RFC3339-like formatted timestamp, surrounded by single-quotes. e.g. `'2018-02-16T00:31:37Z'`. If not provided, the current time will be used. \
  - See https://docs.rs/humantime/latest/humantime/fn.parse_rfc3339_weak.html for more information.";
  + "RFC3339-like formatted timestamp, surrounded by quotes (\"\" or ''). e.g. `'2018-02-16T00:31:37Z'`. If not provided, the \
  + current time will be used. See https://docs.rs/humantime/latest/humantime/fn.parse_rfc3339_weak.html for more information.";
  pub(in crate::deploy) fn arg() -> Arg<'static, 'static> {
  Arg::with_name(ARG_NAME)
  