refactoring: unify match error arms

src/main.rs

@@ -35,10 +35,7 @@ fn main() -> Result<()> {
                     eprintln!("{}", msg)
                 }
             },
-            Err(ReadlineError::Interrupted) => {
-                break;
-            }
-            Err(ReadlineError::Eof) => {
+            Err(ReadlineError::Interrupted) | Err(ReadlineError::Eof) => {
                 break;
             }
             Err(err) => {