Accept token expiration check always true

[andyhot]

The check done in https://github.com/nickbalestra/zero/blob/master/lib/Strategy/acceptToken.js#L43 is
expiration <= Date.now()
however expiration is always 1000 times less than that ( https://github.com/nickbalestra/zero/blob/master/lib/Strategy/requestToken.js#L33 )

[EricWVGG]

^ he's correct. Expiration is measured in seconds, but Date.now() delivers milliseconds.

I just generated a used token and then console-outputted the used tokens date along with Date.now() and received 1596122673 and 1595517972160