message: Add hint about removal of --all-targets
diff: @@ -13,6 +13,11 @@ pub fn cli() -> App {
  "Exclude specific workspace members",
  )
  .arg(Arg::with_name("all").long("all").short("a").hidden(true))
  + .arg(
  + Arg::with_name("all-targets")
  + .long("all-targets")
  + .hidden(true),
  + )
  .arg_features()
  .arg_target_triple(
  "Filter dependencies matching the given target-triple (default host platform)",
  @@ -80,6 +85,11 @@ pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
  )
  .into());
  }
  + if args.is_present("all-targets") {
  + return Err(
  + anyhow::format_err!("the --all-targets flag has been changed to --target=all").into(),
  + );
  + }
  let ws = args.workspace(config)?;
  let charset = tree::Charset::from_str(args.value_of("charset").unwrap())
  .map_err(|e| anyhow::anyhow!("{}", e))?;
  