message: Ensured added tab can be selected
  Same change as before. In new arch props are updated before children are mounted. So can't set selected tab to added tab because it's not there yet. So dispatched async to ensure children are there
diff: @@ -84,12 +84,15 @@ using namespace facebook::react;
  _selectedTab = newViewProps.selectedTab;
  if (_tabBarController.selectedIndex != _selectedTab) {
  if (tabChanged) {
  - _tabBarController.selectedIndex = _selectedTab;
  + dispatch_async(dispatch_get_main_queue(), ^{
  + self->_tabBarController.selectedIndex = self->_selectedTab;
  + [self selectTab];
  + });
  } else {
  _selectedTab = _tabBarController.selectedIndex;
  - }
  [self selectTab];
  }
  + }
  _scrollsToTop = newViewProps.scrollsToTop;
  [super updateProps:props oldProps:oldProps];
  }
  