title: Try to migrate AndroidX to Android AppCompat
body: <p>I have errors when migrate from AndroidX to Appcompat. Here is log build:</p>
  
  <pre><code>Manifest merger failed : Attribute application@appComponentFactory value=(android.support.v4.app.CoreComponentFactory) from [com.android.support:support-compat:28.0.0] AndroidManifest.xml:22:18-91
  is also present at [androidx.core:core:1.0.1] AndroidManifest.xml:22:18-86 value=(androidx.core.app.CoreComponentFactory).
  Suggestion: add 'tools:replace="android:appComponentFactory"' to &lt;application&gt; element at AndroidManifest.xml:18:5-138:19 to override.
  </code></pre>