WrikeWebHook causes exception on recent .NET versions

[Oozza]

Using WrikeWebHook library on ASP.NET Core 3.0+ or Framework 5.0+ causes cast exception because recent ASP.NET doesn't use Newtonsoft.JSON library by default.

Solution is to use Microsoft.AspNetCore.Mvc.NewtonsoftJson package and add services.AddControllers().AddNewtonsoftJson(); in startup.cs program.

This applies to Visual Studio 2019 and ASP.NET MVC project type.
Can be reproduced by using WrikeWebHookControllerBase abstract class.

Thought it could be helpful to mention this in documentation. No need to change code.

[staviloglu]

@Oozza it would be awesome if you could update the documentation and create PR

[Oozza]

Sorry, I don't use Git. If I did I would edit Readme.md to include this text under Webhook section.

NOTE: WrikeApiClient uses Newtonsoft.json serializer, which is not default serializer on ASP.NET Core 3.0+ or Framework 5.0+ versions. On recent ASP.NET projects you may need to install Microsoft.AspNetCore.Mvc.NewtonsoftJson package and activate it with code like this.

services.AddControllers().AddNewtonsoftJson();

[staviloglu]

Added to README.md, thanks @Oozza