Fix Typo of easing function, closes #109

Author: timomeh

lib/PressRippleAnimation.js

@@ -59,7 +59,7 @@ export default class PressRippleAnimation extends React.PureComponent {
     Animated.timing(this.state.animation, {
       toValue: 1,
       duration: this.inAnimationFinished ? 300 : 400,
-      easing: easings.easeIn,
+      easing: easings.easeInOut,
       useNativeDriver: Platform.OS === 'android'
     }).start(() => {
       this.props.onOutEnd()