title: AndroidX MultiDex not found
body: <p>I'm creating a new android project and decided to use the new AndroidX replacement for the support libraries, docs for which can be found here: <a href="https://developer.android.com/jetpack/androidx/migrate" rel="noreferrer">https://developer.android.com/jetpack/androidx/migrate</a>.</p>
  
  <p>I followed the steps to the letter and after syncing gradle I have access to the <code>androidx</code> namespace and various classes contained within. However, when creating my application class I want to inherit from <code>androidx.multidex.MultiDexApplication</code> (which can be seen in the table in the link above). However, the entire <code>multidex</code> package doesn't exist. </p>
  
  <p>Has anyone resolved this issue? Any pointers?</p>