Remove trailing newline at the end of the string

[philipostr]

I am using this crate, along with indent, to generate code. For example:

let inner = indent::indent_by(4, indoc::indoc! {r#"
    println!("hello world");
    return true;
"#});

let outer = indoc::formatdoc! {r#"
    fn do_things() -> bool {{
        {inner}
    }}
"#};

The result should be

fn do_things() -> bool {
    println!("hello world");
    return true;
}

but it actually produces

fn do_things() -> bool {
    println!("hello world");
    return true;

}

Notice the extra newlines after the strings created by the indoc macros. I could fix this by doing either

indoc::indoc! {r#"
    stuff"#};

or

indoc::indoc! {r#"
    stuff
"#}.trim_end().to_string();

but both of these options are ugly, and I am using this crate entirely to not have ugly. I think that this idea is appropriate considering this crate already removes the leading newline as well.