[fix] Linking methods return promises

examples/apis/Linking/LinkingExample.js

@@ -2,11 +2,19 @@ import { Linking, StyleSheet, Text, View } from 'react-native'
 import React, { Component } from 'react';
 import { storiesOf, action } from '@kadira/storybook';
 
+const url = 'https://mathiasbynens.github.io/rel-noopener/malicious.html';
+
 class LinkingExample extends Component {
+  handlePress() {
+    Linking.canOpenURL(url).then((supported) => {
+      return Linking.openURL(url);
+    });
+  }
+
   render() {
     return (
       <View>
-        <Text onPress={() => { Linking.openURL('https://mathiasbynens.github.io/rel-noopener/malicious.html'); }} style={styles.text}>
+        <Text onPress={this.handlePress} style={styles.text}>
           Linking.openURL (Expect: "The previous tab is safe and intact")
         </Text>
         <Text accessibilityRole='link' href='https://mathiasbynens.github.io/rel-noopener/malicious.html' style={styles.text} target='_blank'>