v0.1.16

Cross-build for .NET 6.0 and 7.0

Previously, scip-dotnet was only published against .NET Core 7.0. Now, the published NuGet package includes assemblies for .NET Core 6.0 as well.

• Cross-build to .NET 7.0 and 6.0 by @olafurpg in #24

Full Changelog: v0.1.15...v0.1.16