Currently, knockknock will only print the error message instead of raise an error when win10toast is not install on win10 desktop. This PR fixes it so that user will correctly see
ImportError: Error: to use Windows Desktop Notifications, you need to install `win10toast` first. Please run `pip install win10toast==0.9`.
instead of
UnboundLocalError: local variable 'ToastNotifier' referenced before assignment
Currently, knockknock will only print the error message instead of raise an error when
win10toast
is not install on win10 desktop. This PR fixes it so that user will correctly seeinstead of