If a status update is updated (for example, going from starting -> done)

without an associated review, timestamps wouldn't be updated such that the

review request ETag would change. To fix that, I've added auto_now to the

timestamp field so that it gets updated whenever the status update is changed,

and fixed the ETag calculation to look at all the status update timestamps.

Posted a review and had Review Bot start. Saw that the initial status update

was marked as "starting", and then reloaded. Whereas before it would still show

as starting (without a shift+reload), now it showed that the tool ran

sucessfully.