.net standard 2.0 support

[uuggene]

Is it possible to support new table ScheduledCommand in netstandard2.0?

I found that WorkflowCore.Persistence.EntityFramework requires netstandard2.1 starting from version 3.6.0.

But I a lot of other libraries still support netstandard2.0.
This change is very critical, because we can't use this library in .net 4.6 projects anymore.

I tried to find why WorkflowCore.Persistence.EntityFramework requires netstandard2.1, and there are only 2 changes in one file to support netstandard2.0.
EntityFrameworkPersistenceProvider.cs

[danielgerlag]

EFCore dropped support for netstandard2.0 in v5

[uuggene]

It's still possible to use EFCore 3.1.* as you do in project WorkflowCore.Persistence.EntityFramework:

<PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.1.2" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="3.1.2" />