2.0.0 Release

[nblumhardt]

• Update README.md #32 - README updates (@LiorBanai)
• Bump Serilog version dependency to support Unity and .netstandard 2.0+ #43 - Serilog dependency updates (@bdovaz)
• Update SDK and targets to match Serilog 3 #54 - update targets to match Serilog 3 (@pmetz-steelcase)
• Include Serilog 3.1 trace and span ids in output #56 - update to Serilog 3.1, include trace and span ids in output when present (@nblumhardt)
• Build updates (@SimonCropp)

[LiorBanai]

Hi @nblumhardt , why not wait for net8 (next week) which adds many perf improvements and include it in the supported frameworks?

[nblumhardt]

Thanks for the note @LiorBanai! We'll add .NET 8 to Serilog's TFMs and flow it back through these projects 👍 There are a stack of Serilog.Extensions.* packages that need to go out simultaneously with .NET 8 and which depend on Serilog 3.1 so it's a bit of a chicken-and-egg problem otherwise :-)