title: OnPress not working for Marker in react-native-maps
body: <p>I would like to perform some action when pressing one of the <code>Markers</code> on a map. What I have:</p>
  
  <p>1) A <code>MapView</code>, like this:</p>
  
  <pre><code>&lt;MapView
      provider={PROVIDER_GOOGLE}
      initialRegion={this.state.region}
      style={styles.map}&gt;
      {this.displayRouteLocations(locations)}
  &lt;/MapView&gt;
  </code></pre>
  
  <p>2) My method <code>displayRouteLocations</code> does the following:</p>
  
  <pre><code>displayRouteLocations(locations) {
      return locations.map((location, i) =&gt; {
          return (
              &lt;PointMarker
                  key={i}
                  coordinate={location}
                  title={location.name}
                  description={location.description}
                  onPress={() =&gt; alert('test')}
              /&gt;
          );
      });
  }
  </code></pre>
  
  <p>3) Finally, <code>PointMarker</code> is a separate component like this:</p>
  
  <pre><code>import {Marker} from 'react-native-maps';
  
  class PointMarker extends Component {
      render() {
          return (
              &lt;Marker
                  {...this.props}
                  pinColor={'#f6c23d'}
                  tracksViewChanges={false}
              /&gt;
          );
      }
  }
  </code></pre>
  
  <p>I don't know why <code>onPress</code> doesn't work on <code>PointMarker</code>. I pass it to react-native-maps <code>Marker</code>, but somehow it isn't triggered when I press on the markers. </p>
  
  <p>I already tried searching for answers in react-native-maps official documentation on GitHub. In <a href="https://github.com/react-native-community/react-native-maps/blob/master/example/examples/MarkerTypes.js" rel="nofollow noreferrer">this example</a> they do pretty much the same (call an arrow function onPress). However, it doesn't work in my case.</p>
  
  <p>I'm testing the app on Android.</p>