Update README.md

Author: Econa77

Example/Example/AppDelegate.swift

@@ -33,6 +33,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
                 Swift.print("Updated image")
             })
             .disposed(by: disposeBag)
+        screeen.start()
     }
 
     func applicationWillTerminate(_ aNotification: Notification) {

README.md

@@ -49,6 +49,7 @@ observer.rx.removedImage
   .subscribe(onNext: { image in
     // Remove events image
   })
+observer.start()
 ```
 
 ## Dependencies