Remove hard ref to Json.net

[nhaberl]

Hi, would be great to abstract the serialization so any Json library can be used ... as there is native support now I won't rather install Json.Net.

[jchristn]

Hi @nhaberl I'm open to doing that (and could do that in other projects too). Could you point me toward a reference? Thanks!

[jchristn]

Moving this to a discussion, not a bug. If you have a PR on this I'd be happy to integrate if it aligns with the intent of the library. Cheers, Joel