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

Author: Koenraad Verheyden

src/bin/cratesfyi.rs

@@ -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")