message: add note on single-quotes around timestamp
diff: @@ -237,7 +237,7 @@ pub(super) mod timestamp {
  const ARG_NAME: &str = "timestamp";
  const ARG_VALUE_NAME: &str = "TIMESTAMP";
  const ARG_HELP: &str =
  - "RFC3339-like formatted timestamp. e.g. `2018-02-16T00:31:37Z`. If not provided, the current time will be used. \
  + "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.";
  pub(in crate::deploy) fn arg() -> Arg<'static, 'static> {
  