Add .NET Standard 2.1 support
Add .NET Standard 2.1 support

cloudRoutine/Paket,baronfel/Paket,cloudRoutine/Paket,theimowski/Paket,fsprojects/Paket,sergey-tihon/Paket,thinkbeforecoding/Paket,inosik/Paket,cloudRoutine/Paket,jam40jeff/Paket,sergey-tihon/Paket,jam40jeff/Paket,thinkbeforecoding/Paket,fsprojects/Paket,thinkbeforecoding/Paket,inosik/Paket,cloudRoutine/Paket,thinkbeforecoding/Paket,baronfel/Paket,theimowski/Paket