Resolve clap deprecations
Resolve clap deprecations

    warning: use of deprecated variant `clap::AppSettings::DontCollapseArgsInUsage`: Replaced with `Command::dont_collapse_args_in_usage` and `Command::is_dont_collapse_args_in_usage_set`
      --> src/opts.rs:16:32
       |
    16 |         setting = AppSettings::DontCollapseArgsInUsage
       |                                ^^^^^^^^^^^^^^^^^^^^^^^

    warning: use of deprecated associated function `clap::CommandFactory::into_app`: Replaced with `CommandFactory::command
       --> src/opts.rs:168:30
        |
    168 |     <Opts as clap::IntoApp>::into_app().debug_assert();
        |                              ^^^^^^^^

dtolnay/cargo-expand