Validate->notBefore should allow same sec timestamp

[wire67]

notBefore fails if the request is checked in the same timestamp it was generated: timestamp is 1000ms vs a HTTP request of few 10 to 100ms.
replace
$notBefore < time()
by
$notBefore <= time()
in
Validate.php
this also does not allow for any clock drift between systems

[RobDWaller]

Hi, thanks for sharing this. I believe you are correct I will make this change.

[RobDWaller]

Closing this issue as the core problem should be solved in the latest release. https://github.com/RobDWaller/ReallySimpleJWT/releases/tag/4.0.3