Better API support for adding header to JsonWebSignature

[Marcin Nowak]

As a developer I' like to have simpler API for adding header to JsonWebSignature. Current interface exposes internal implementation. To add new header first we need to call getHeaders() when setObjectHeaderValue():

JsonWebSignature jws = new JsonWebSignature();
jws.getHeaders().setObjectHeaderValue(HeaderParameterNames.BASE64URL_ENCODE_PAYLOAD, false);

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[Brian Campbell]

done with 58ea0d3

[Marcin Nowak]

Thank you. Waiting for release.

[Brian Campbell]

coming soon(ish)

[Brian Campbell]

released in jose4j-0.7.0 https://bitbucket.org/b_c/jose4j/wiki/Release%20Notes#!jose4j-070-january-17-2019