title: react native mapbox getCenter not working
body: <p>I have a problem with this lib.
  I am trying to get the current center coordinate from the map by (onPress), but none to display,</p>
  
  <pre><code>agree = async () =&gt; {
    const center = await this._map.getCenter();
    console.warn(center);
  }
  </code></pre>
  
  <p>the map code.</p>
  
  <pre><code>&lt;MapboxGL.MapView
    ref={(c) =&gt; this._map = c}
    style={{ flex: 1 }}
    zoomLevel={15}
    centerCoordinate={[-122.084, 37.422]}&gt;
  &lt;/MapboxGL.MapView&gt;
  </code></pre>
  
  <p>and I am using onPress like this: </p>
  
  <pre><code>&lt;TouchableOpacity
    style={styles.button}
    onPress={this.agree.bind(this)}
  &gt;
    &lt;Text style={styles.buttonText}&gt;NYC&lt;/Text&gt;
  &lt;/TouchableOpacity&gt;
  </code></pre>
  
  <p>Any Help?</p>