title: defining expo entryPoint in app.json does not work
body: <p>I am building a React-Native android application. I want to move the App.js file into a src folder for a cleaner file structure so I added this line to the app.json file inside the expo object:</p>
  
  <pre><code>{
    "expo": {
      "entryPoint": "./src/App.js",
  </code></pre>
  
  <p>When I run the app I get the same old default expo App. It doesn't matter what I have in the file. The moment I change anything it throws this error:</p>
  
  <pre><code>Unable to resolve "../../App" from "node_modules/expo/AppEntry.js"
  </code></pre>
  
  <p>I also tried adding this line to the file as recommended <a href="https://stackoverflow.com/questions/47742280/define-entry-point-for-react-native-app">here</a>:</p>
  
  <pre><code>export default Expo.registerRootComponent(App);
  </code></pre>
  
  <p>I'm using Linux and an android studio simulator.</p>