Rename ControlFlow variant from Complete to Break

examples/proxy.rs

@@ -22,7 +22,7 @@ fn main() {
         println!("{:?}", event);
         match event {
             winit::Event::WindowEvent { event: winit::WindowEvent::Closed, .. } =>
-                winit::ControlFlow::Complete,
+                winit::ControlFlow::Break,
             _ => winit::ControlFlow::Continue,
         }
     });