Add onAnimationFinish example

Author: Minishlink

docs/stories/index.js

@@ -6,4 +6,5 @@ import { storiesOf } from '@storybook/react';
 // Gift animation by Jan Semler https://www.lottiefiles.com/u/141
 storiesOf('Lottie', module)
   .add('basic', () => <Animation source={require('./assets/gift.json')} autoPlay />)
-  .add('loop', () => <Animation source={require('./assets/gift.json')} loop autoPlay />);
+  .add('loop', () => <Animation source={require('./assets/gift.json')} loop autoPlay />)
+  .add('onAnimationFinish', () => <Animation source={require('./assets/gift.json')} autoPlay onAnimationFinish={() => alert('Finished!')}/>);