Replace deprecated failure crate with anyhow

[dtolnay]

failure is risky to use in modern code because its formatting macros are not compatible with https://rust-lang.github.io/rfcs/2795-format-args-implicit-identifiers.html.

fn main() {
    if let Err(err) = do_main() {
        eprintln!("{}", err);
    }
}

fn do_main() -> Result<(), failure::Error> {
    let person = "dtolnay";
    failure::bail!("person {person}");
    Ok(())
}

Output:

person {person}