fix(Errors): tones down quoting in some error messages
fix(Errors): tones down quoting in some error messages

Closes #309

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