title: React Native StatusBar: dark-content not working on android
body: <p>I'm trying to change the color of the title and the icons of the status-bar to be black.
  so, according to the react-native status-bar documentation, I set the <code>barStyle</code> to <code>dark-content</code> but nothing change.</p>
  
  <p><code>&lt;StatusBar barStyle="dark-content" backgroundColor={'white'} /&gt;</code></p>