v6.4.12

Changes:

• 55b1fe2 Fix duplicate dll in package error
• 64bdfb5 Include System.Data.SqlClient in netstandard2.1 to allow building under dotnet cli
• 37e0305 Fix building using dotnet build
• 5c9da60 Tidy formatting in ReadMe [skipci]
• a59456e Add shields to readme [skipci]

This list of changes was auto generated.