Make ControlFlow::Wait the default (#3106)

README.md

@@ -35,7 +35,7 @@ another library.
 ```rust
 use winit::{
     event::{Event, WindowEvent},
-    event_loop::{ControlFlow, EventLoop},
+    event_loop::EventLoop,
     window::WindowBuilder,
 };
 
@@ -44,8 +44,6 @@ fn main() {
     let window = WindowBuilder::new().build(&event_loop).unwrap();
 
     event_loop.run(move |event, elwt| {
-        elwt.set_control_flow(ControlFlow::Wait);
-
         match event {
             Event::WindowEvent {
                 event: WindowEvent::CloseRequested,