message: Remove .index(1) from Arg
  From clap::Arg::index documentation:
  > NOTE: If no Arg::short, or Arg::long have been defined, you can
  > optionally leave off the index method, and the index will be assigned
  > in order of evaluation. Utilizing the index method allows for setting
  > indexes out of order
diff: @@ -83,13 +83,11 @@ pub fn main() {
  .subcommand(SubCommand::with_name("add")
  .about("Add a crate to the blacklist")
  .arg(Arg::with_name("CRATE_NAME")
  - .index(1)
  .required(true)
  .help("Crate name")))
  .subcommand(SubCommand::with_name("remove")
  .about("Remove a crate from the blacklist")
  .arg(Arg::with_name("CRATE_NAME")
  - .index(1)
  .required(true)
  .help("Crate name"))))
  .subcommand(SubCommand::with_name("start-web-server")
  