Well there is an orange Arrow right on top if there is an update, so in my simplicity I think it should be possible to use that for a pushnotification or e-mail.
(I never look at HG, once devices are included and set it is finished for me. I use HG as Home Automation and like it says all needs to be done automatic. But I don't want to miss an (important) update).
Me and writing scripts hmmm, it will take a while, a very long while.
I must have messed up with SF because I only receive a message when there is a update for windows not for Pi.