title: Switch from fs-promise to fs-extra
body: <p>I try to install create-react-native-app package and i got this warning:</p>
  
  <pre><code>npm install -g create-react-native-app
  npm WARN deprecated fs-promise@1.0.0: Use mz or fs-extra^3.0 with Promise Support
  </code></pre>
  
  <p>Then I have tried to install fs-extra, and retry an installation of create-react-native-app package:</p>
  
  <pre><code>npm uninstall -g create-react-native-app
  npm install -g fs-extra
  npm install -g create-react-native-app
  </code></pre>
  
  <p>But I still got the same warning, any clue to solve this?</p>
  
  <p>Thx,</p>
  
  <p>Orb</p>