title: Flutter: How to use HapticFeedback
body: <p>I have imported</p>
  <pre><code>import 'package:flutter/services.dart';
  </code></pre>
  <p>and then called</p>
  <pre><code>HapticFeedback.lightImpact();
  </code></pre>
  <p>nothing happens. What do I need to do to get it working?
  I am testing with the latest Flutter version 1.6.6 on a Galaxy S8 running Android 9.0</p>