message: Removed androidx imports
  Want to try and keep androidx only in FragmentNavigator then it might work in RN < 0.60. Elevation only works in lolliipop so users can stick with activiites before that
diff: @@ -13,12 +13,6 @@ import android.util.Pair;
  import android.view.View;
  import android.view.ViewGroup;
  -import androidx.core.view.ViewCompat;
  -import androidx.fragment.app.Fragment;
  -import androidx.fragment.app.FragmentActivity;
  -import androidx.fragment.app.FragmentManager;
  -import androidx.fragment.app.FragmentTransaction;
  -
  import com.facebook.react.bridge.ReadableArray;
  import com.facebook.react.modules.core.DeviceEventManagerModule;
  import com.facebook.react.uimanager.ThemedReactContext;
  @@ -54,7 +48,8 @@ public class NavigationStackView extends ViewGroup {
  return;
  }
  SceneView scene = (SceneView) child;
  - ViewCompat.setElevation(scene, index);
  + if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
  + scene.setElevation(index);
  sceneKeys.add(index - 1, scene.sceneKey);
  scenes.put(scene.sceneKey, scene);
  }
  