Add support for byte diffing (#7)

Restructured text diffing to also support bstr

examples/terminal.rs

@@ -14,7 +14,7 @@ fn main() {
                 ChangeTag::Insert => ("+", Style::new().green()),
                 ChangeTag::Equal => (" ", Style::new()),
             };
-            print!("{}{}", style.apply_to(sign).bold(), style.apply_to(change),);
+            print!("{}{}", style.apply_to(sign).bold(), style.apply_to(change));
         }
     }
 }