Update README.md

Author: aryaxt

README.md

@@ -118,6 +118,9 @@ Closes the menu and calls the completion block oppon animation completion
 
 ###### - (void)toggleLeftMenu;
 Toggles the left menu open or close depending on the existing state. This was made public in order to pass the selector to a custom UIBarButtonItem (ex: UIBarButtonItem with a button as a custom view)
+
+###### - (void)bounceMenu:(Menu)menu withCompletion:(void (^)())completion;
+Bounces either right or left menu, and calls the completion block oppon animation completion
 ```
 UIButton *button  = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];
 [button setImage:[UIImage imageNamed:@"menu-button"] forState:UIControlStateNormal];