v1.0.5 - 28 Sep 2020
* Reinstate PrivateParams() method in jws and jwe packages.
These used to be available until v1.0.0, but somehow got lost during the
big change.
As a workaround for users of versions 1.0.0 to 1.0.4, you could have
achieved the same thing using AsMap() methods, albeit with a slight
performance penality (#205, #206)