Most apps populate this information under 'Help -> About'. It'd sure be nice to know if I've upgraded to the latest beta, or if I'm running an older "stable" release, or what.
Have a look at the title of your sublime window
Thanks - I've always run mine in full-screen mode, didn't even think about looking there.
satil a valid issue if you select help about and you don't have a internet connection it produces, interesting results. Most apps have a dialog in about and a link to the web site, not just going there.
Linux: Listing ~/.config should at least give away sublime-text-3, if that's your version.