Make nuget package and sample work

[stefandevo]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Doc update and nuspec update

What is the current behavior? (You can also link to an open issue here)

The ; in the Readme where at the wrong position. The dependency on Newtonsoft.Json caused an issue with ios and android projects. Just removed because not necessary.

What is the new behavior (if this is a feature change)?

Does this PR introduce a breaking change?

No

Please check if the PR fulfills these requirements

• [x] The commit follows our guidelines: https://github.com/serilog/serilog#contribute
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

Other information:

Please upload an update nuget package.

[stefandevo]

CI fails because of no Mac remote agent...

[nblumhardt]

Thanks @stefandevo - LGTM!

@ghuntley any thoughts on the CI aspect? Cheers!

[ghuntley]

Thanks @stefandevo for the PR. The CI defect was unrelated to this unit of work; latest version of Xamarin has dropped support for compiling 32bit libraries/applications and msbuild now throws exceptions. The sink was upgraded as part of #6 and the new release (v0.1.25) is now available on nuget.org.