Reeder has a new version with an all new concept out now.
Instead of being an RSS client, it’s more of an everything client. Because of this and other changes in direction, it no longer syncs with Feedbin.
If Reeder + Feedbin is working well for you, good news, you don't have to do anything. The app you already have still syncs with Feedbin. It's now known as Reeder Classic and it will even continue to get updates.