Library for demonstration

Usage

``` // Cargo.toml

[dependencies]
hello_lib = "0.1.5"

```

``` // main.rs

use hello_lib::hello;

fn main() {
    println!("{}", hello("Rachel"));
    println!("{}", hello(31));
    println!("{}", hello(3.14));
    println!("{}", hello(true));
    println!("{}", hello('G'));
}

```