title: How start watchman in react-native project
body: <p>I've create my first react-native app with <code>react-native init myProject</code> and running in my android emulator.</p>
  
  <p>But, if i edit my index.js, my app don't refresh (i need to push double R).</p>
  
  <p>I run my app with <code>react-native run-android</code> and server with <code>npm start</code>.</p>
  
  <p>watchman is installed on my Ubuntu, <code>watchman -v</code> return :</p>
  
  <p><code>4.9.0</code></p>
  
  <p>Anyone can help me ? </p>
  
  <p>Thank you community !</p>