FETT paper link may need updating (Vladimir)

[Nat Sakimura]

Hi Nat,

We noticed the FETT paper link may need updating, because the paper is
no longer there:

https://tools.ietf.org/html/draft-ietf-oauth-jwsreq-18#section-15.2

I managed to find the paper here:

https://sec.uni-stuttgart.de/_media/publications/FettKuestersSchmitz-CCS-2016.pdf

and

https://arxiv.org/pdf/1601.01229v2.pdf

Thanks,

Vladimir

[Nat Sakimura]

Fixed #82 FETT paper link may need updating (Vladimir)

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