Playframework oauth small upgrade

[bflamand]

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[bflamand]

this is required in some circumstances to tolerate some clock synchronization issues between backends and oauth authentification server. Configurable by the application to the desired value, default 3 sec.
This is the only thing that is changed by this pull request.

[JFCote]

LGTM. @wing328 Can you merge?

[wing328]

Thanks again for the PR, which has been included in the v6.0.0 release: https://twitter.com/oas_generator/status/1529669733934841856