Support for derived setup classes

[bramerdaniel]

I want to support this

 [FluentSetup(typeof(Person))]
 public partial class PersonSetup
 {

 }

and


[FluentSetup(typeof(Employee))]
public partial class EmployeeSetup : PersonSetup
{
}

where

internal class Employee : Person
{
   public string Company { get; set; }
}