Update README.md

Author: rustamburger-mrustaa

README.md

@@ -233,6 +233,12 @@ class ViewController: UIViewController {
 }
 ```
 
+For an already created ButtonView to update the animation type
+
+```swift
+ self.prgmButtonClickStyleView?.update(animationType: type, allSubviews: true)
+```
+
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 ![image](https://github.com/mrustaa/GifPresentations/blob/master/ButtonClickStyle/ui3.gif)