Expect insetad of unwrap for initialization

src/main.rs

@@ -18,7 +18,7 @@ fn main() {
     let mut args = env::args();
     args.next();
     let address = args.next().unwrap_or("127.0.0.1:8080".to_string());
-    let listener = TcpListener::bind(address).unwrap();
+    let listener = TcpListener::bind(address).expect("Invalid bind address!");
     eprintln!("Strated server!");
 
     for stream in listener.incoming() {