title: followUserLocation prop not working for React Native MapView
body: <p>I'm very puzzled by a certain issue I'm having. I'm simulating a freeway drive, and I'm trying to follow the user location. By default this should already be on if showsUserLocation is true. That prop works. However the simulator is not centering on the user location as it moves. In my code below all the props work, except for the followUserLocation... what am I doing wrong? </p>
  
  <pre><code>return (
    &lt;View style={styles.container}&gt;
      &lt;MapView
        style={styles.map}
        showsUserLocation={true}
        followUserLocation={true}
        showsCompass={false}
      &gt;
      &lt;/MapView&gt;
    &lt;/View&gt;
  </code></pre>