Remove stop print

src/context/signal.rs

@@ -50,7 +50,7 @@ pub extern "C" fn signal_handler(sig: usize) {
                 }
             },
             SIGSTOP | SIGTSTP | SIGTTIN | SIGTTOU => {
-                println!("Stop {}", sig);
+                // println!("Stop {}", sig);
 
                 {
                     let contexts = contexts();