pshell 1.0.17

Works out if this is running from inside a shell, and if so, which one.
Documentation 
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fn main() {
    // `find` returns the name of the shell in a string and the pid as a u32
    let (sh, pid) = pshell::find().unwrap_or(("unknown".to_string(), 0));
    println!(
        "This application has been run from pid `{}`, which is a {} shell",
        pid, sh
    );
}