2.5.5 should be hitting the app servers soon.
This is an important update as it paves the way for subscriptions.
Please check the about page in settings as this will tell you which kind of subscription the app thinks you are entitled to - everyone should get premium.
The plan at the moment - to be tested in the next beta - is to automatically grant a life time premium subscription to users the app identifies as having previously paid. The mechanics of how this happens are still to be determined, but I will share with you when I know more.
The update also includes a tip jar, all donations gratefully received, as well as bugs fixes and a precipitation probability slider in the Units section in settings. You can use the slider to hide rain or snow forecast information when the probability is below the slider value. It's not completely hidden should you still wish to access it, for example it will be reported in the timeline.