They will if they subscribed to your repo's new releases (with GitHub's "watch" function)
I used to use watch but I could care less about every individual commit on anything other than projects I'm actively working on.
Watch is not a good substitute for a way to learn about important changes on an infrequent, regular basis (i.e. once a month emails).
Email is the only reliable way to send/receive important updates for any meaningful project.