Make state changes more machine readable

src/main.rs

@@ -71,10 +71,10 @@ fn main() -> Result<()> {
                                 let cameras_are_running_after = running_cameras.borrow_mut().len() > 0;
                                 if cameras_are_running_before != cameras_are_running_after {
                                     if cameras_are_running_after {
-                                        println!("On air");
+                                        println!("on-air");
                                     }
                                     else {
-                                        println!("Off air");
+                                        println!("off-air");
                                     }
                                 }
                             }