There’s no change log, per se. But, the commit history of the zwave binding (if you are so inclined to keep an eye on it) will show the changes to the binding.
For new device additions, or changes to existing devices, you would want to look at the Database Updates. In this case, the ZWA003 was added 6 days ago. Therefore, it is in the current snapshot version of the binding.
You don’t need to update the entire openHAB installation. You can just update the zwave binding as described here.
Post back here if you run into any issues.