Target .NET Standard 2.0

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All the dependencies (Docnet.Core, SixLabors.ImageSharp and Verify) support .NET Standard 2.0 and Verify.DocNet code itself is also .NET Standard 2.0 compliant.

This makes Verify.DocNet available to .NET Framework 4.7.2 and .NET Core 2.0+ for free and reduces the size of the NuGet package since only one dll is required instead of two.

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I found about this when trying to integrate Verify.DocNet in a project targeting .NET Core 3.1. I didn't see this warning:

[NU1701] Package 'Verify.DocNet 0.4.0' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8' instead of the project target framework '.NETCoreApp,Version=v3.1'. This package may not be fully compatible with your project.

Then eventually I got this error when running the unit tests:

System.IO.FileNotFoundException
Could not load file or assembly 'Docnet.Core, Version=2.3.1.0, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.

I could probably have manually added Docnet.Core as a dependency in the unit test project but the proper solution is really to make Verify.DocNet target .NET Standard 2.0.

[SimonCropp]

good point. will deploy now