fix match lint

lib/src/lib.rs

@@ -179,11 +179,13 @@ where
 
     fn process_messages(&mut self) {
         while let Ok(msg) = self.receiver.try_recv() {
+            #[allow(clippy::single_match)]
             match msg {
                 EmulatorMessage::Stop => {
                     self.cpu.memory.flush_rom();
                     exit(0);
                 }
+                _ => {}
             }
         }
     }