issue on window.closing

Hello :) I just installed your software, its great. Not sure if its just me but when I first installed it I was getting an error in main.py. It seems windowpy has  ```window.closing``` (your line 110 ```window.closing+=onclose```) to be ```window.events.closing``` now? When I made the ```window.events.closing+=onclose``` change in the line, the software ran okay afterward. Thanks!