Update Newtonsoft.Json package references to 12.0.2

[HenrikNergaard-INS]

No description provided.

[HenrikNergaard-INS]

@manuc66
It looks like your sonar token is no longer valid.

At line:2 char:5
+     SonarScanner.MSBuild.exe begin /k:"manuc66:JsonSubtypes" /d:"sona ...
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (The format of t...gin= is invalid:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError
 
The format of the analysis property sonar.github.oauth= is invalid

[manuc66]

@HenrikNergaard-INS in fact it can not be decrypted from a build coming from a Pull request of another appveyor user because of the encrypted value here :

JsonSubTypes/appveyor.yml

Line 7 in 05c43b0

secure: XUib5rF8Uxwk7S2umtsFEQ9t5G0p/J3G3PNpWLZuNIyw/zNufLDCge8C6QJRTzQw

I don't know how to fix that without exposing the token publicly which is something I don't want (I you know how to fix that, you're welcome ;-)).

So don't bother with this error...

[manuc66]

What about using floating version ?

https://docs.microsoft.com/en-us/nuget/consume-packages/package-references-in-project-files#floating-versions

I would hope it could resolve #41 and #40

[HenrikNergaard-INS]

Floating versions should only be used for patch versions, maybe minor versions, but not major ones. From the documentation:
The Nearest Wins rule can result in a downgrade of the package version, thus potentially breaking other dependencies in the graph. Hence this rule is applied with a warning to alert the user.

Newtonsoft adds both bugfixes and new features in patch versions so I do not think it is a good idea to wildcard patch versions for this dependency.
https://github.com/JamesNK/Newtonsoft.Json/releases