wherr 0.1.3

Enhance Rust error messages with file and line details using the `#[wherr]` macro for clearer debugging.
Documentation 
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fn add(s1: &str, s2: &str) -> Result<i64, Box<dyn std::error::Error>> {
    let radix = 10;
    let i1 = i64::from_str_radix(s1, radix)?;
    let i2 = i64::from_str_radix(s2, radix)?;
    Ok(i1 + i2)
}

fn main() {
    let x = add("123", "not a number");
    println!("x = {:?}", x);
}