1.0.3 is in Play, if you do not see it, just wait till it will be available. If you are on last version, you need to switch night mode off/on to see it on after update (and look at Transition period, when not Instant, you will see Night mode only after 10 or 60 sec)
Edit: Never mind, it's changing it now. I guess maybe the reboot did help. Or I was being stupid and not noticing the change before. *shrug* Sorry for the spammy messages! (And for having to wait five minutes before I could edit this.) So instead: thanks for putting this option back in!