Update for Animated.Region react-native-maps#24 Fix on the AnimatedMarkers Example (react-native-maps#1889)

* Update for react-native-maps#24 Fix

Fix for 'Animated.Region undefined constructor' in recent react-native version. 
Solved by using MapView.AnimatedRegion instead of Animated.Region

* Change Animated.Region react-native-maps#24 on AnimatedMarkers Example

Fix for 'Animated.Region undefined constructor' in recent react-native version.
Solved by using MapView.AnimatedRegion instead of Animated.Region

Author: timotew

example/examples/AnimatedMarkers.js

@@ -5,7 +5,6 @@ import {
   Text,
   Dimensions,
   TouchableOpacity,
-  Animated,
 } from 'react-native';
 
 import MapView from 'react-native-maps';
@@ -23,7 +22,7 @@ class AnimatedMarkers extends React.Component {
     super(props);
 
     this.state = {
-      coordinate: new Animated.Region({
+      coordinate: new MapView.AnimatedRegion({
         latitude: LATITUDE,
         longitude: LONGITUDE,
       }),