Watchtower as it is no longer maintained
Not to take away anything from the OP, but there is a fork of Watchtower that is maintained and works a lot better than the OG Watchtower. The original Watchtower would screw up the update fairly regularly. So, if you want to just yolo your updates, that'd be the way to go. If you want a bit more control, DockCheck seems to have that covered. It's always good to have choices.