style: remove #[allow("warning that apparently doesn't exist")]
style: remove #[allow("warning that apparently doesn't exist")]

I say "apparently" because it's listed on https://manishearth.github.io/rust-clippy/master/
and not as deprecated.

clap-rs/clap,clap-rs/clap,kbknapp/clap-rs,kbknapp/clap-rs,clap-rs/clap