title: Permissions not working in react native Expo standalone app (build)
body: <p>I am trying to get Location permissions in react native expo but failed to do so.
  I searched a lot for it but couldn't find a proper solution.
  the code snippet for Location permission is:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code> async componentDidMount(){
      try {
        const granted = await PermissionsAndroid.request(
          PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION,
          {
            'title': 'Location Permission',
            'message': 'Allow App to use location of your device.' 
                       
          }
        )
        if (granted === PermissionsAndroid.RESULTS.GRANTED) {
          console.log("got")
          this.setState({show:false});
        } else {
          console.log("failed")
        }
      } catch (err) {
        console.log('error',err)
      }
      
      
    }</code></pre>
  </div>
  </div>
  </p>
  
  <p>It shows the following error:</p>
  
  <p>error [Error: Tried to use permissions API but the host Activity doesn't implement PermissionAwareActivity.]</p>
  
  <p>I am using</p>
  
  <p>"expo": "^25.0.0",
  "react": "16.2.0",
  "react-native": "<a href="https://github.com/expo/react-native/archive/sdk-25.0.0.tar.gz" rel="nofollow noreferrer">https://github.com/expo/react-native/archive/sdk-25.0.0.tar.gz</a>",</p>
  
  <p>Thanks</p>