title: index.android.bundle not updating when creating release build
body: <p>I'm working on a Project in ReactNative &amp; it's working fine in debug build (When installing via <strong>react-native run-android</strong> but When I generate a release build it crashes as soon as I open it, according to logs it's unable to load script, and <strong>android/app/src/main/assets</strong> directory is empty.</p>
  
  <p>To resolve <strong>this</strong> I had to run these commands:
  <code>react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res</code></p>
  
  <p><code>rm -rf ./android/app/src/main/res/drawable-*</code></p>
  
  <p>But now the file <strong>index.android.js</strong> won't update in a release build, so I have to run the above commands every time I need a release build, what am I doing wrong? </p>
  
  <p>Here are my packages.json details:</p>
  
  <pre><code>"scripts": {
      "start": "node node_modules/react-native/local-cli/cli.js start",
      "test": "jest"
    },
  
  
  
  "react": "16.8.3",
      "react-native": "0.59.5"
  </code></pre>
  
  <p><strong><em>In short:</em></strong> How to create or update index.android.bundle automatically when I generate a release build?</p>