prefix attribute does not work for EnumString

[yrns]

Maybe this isn't supposed to work, but the changelist kind of implies it should:

use strum_macros::{Display, EnumString};

#[derive(Debug, PartialEq, EnumString, Display)]
#[strum(prefix = "colour/")]
enum Color {
    #[strum(to_string = "RedRed")]
    Red,
}

fn main() {
    assert_eq!(String::from("colour/RedRed"), (Color::Red).to_string()); // works
    assert_eq!(Color::try_from("colour/Red"), Ok(Color::Red)); // this fails
    assert_eq!(Color::try_from("colour/RedRed"), Ok(Color::Red)); // this fails
}

[Peternator7]

Flipping through the code, this is definitely not implemented for TryFrom/FromStr 😟. Must've been an oversight back then. I think fixing it for consistency is reasonable, but it is a breaking change so I'll probably be strategic about when it merges.