Reminder about verifiable claims use cases

A number of you had indicated you were going to some reviewing of the VF
use cases [1].  Please try to have a detailed look at them and send in your
comments as soon as possible so we can continue our clean up / tightening
of the document!

[1] http://w3c.github.io/webpayments-ig/VCTF/use-cases/

-- 
-Shane