Consider reducing requirement to .NET Standard 2.0

[weweilep]

While EntityFrameworkCore 3.0 required .NET Standard 2.1, 3.1 has been relaxed to .NET Standard 2.0

Please consider a nuget package that targets .NET Standard 2.0 for better compatibility.

[borisdj]

NuGet 3.1.0 is now targeting .NET Standard 2.0

Also to add Here more detailed versioning table:

Nuget Version	Target	Referenced EF v.	For projects targeting
3.1.0 - 3.6.1	NetStandard 2.0	EF Core 3.1	NetCore(2.0+) or NetFrm(4.6.1+)
3.0.0 - 3.0.5	NetStandard 2.1	EF Core 3.0	NetCore(3.0)
2.4.2 - 2.6.4	NetStandard 2.0	EF Core 2.2	NetCore(2.2) or NetFrm(4.6.1+).
2.0.9 - 2.4.1	NetStandard 2.0	EF Core 2.1
2.0.0 - 2.0.8	NetStandard 2.0	EF Core 2.0
1.0.0 - 1.1.0	NetStandard 1.4	EF Core 1.0