Change to netstandard2.0 to be compatible with .Net#72

CygnusBill wants to merge 2 commits intoNitroDevs:mainNitroDevs/CSharpFunctionalExtensions.FluentAssertions:mainfrom

CygnusBill:netstandard2.0CygnusBill/CSharpFunctionalExtensions.FluentAssertions:netstandard2.0Copy head branch name to clipboard