fix(Required Args): fixes a bug where required args are not correctly accounted for
fix(Required Args): fixes a bug where required args are not correctly accounted for

Closes #343

sru/clap-rs,clap-rs/clap,clap-rs/clap,clap-rs/clap,cstorey/clap-rs,cstorey/clap-rs,sru/clap-rs,cstorey/clap-rs,kbknapp/clap-rs,kbknapp/clap-rs,sru/clap-rs