When polymorphism is present, csharp code has an issue on positional parameters

Created by: scavarda

Description

CSharp client for framework netcoreapp2.0 version. When polymorphism is present, such as MyJob extends Job, MyJob constructor calls base constructor with not named arguments, when these arguments are not optional. This issue occurs when a parameter is Enum type and so it's required, not optional

public partial class Job :  IEquatable<Job>, IValidatableObject
{
  public Job(long? jobId = default(long?), JobStatusEnum? jobStatus = default(JobStatusEnum?), string name = default(string))
  {
  ...
  }
}

public partial class MyJob : Job,  IEquatable<MyJob>, IValidatableObject
{
  public MyJob(...) : base(jobStatus)
}

Swagger-codegen version

swagger-codegen-cli-2.4.0-20181007.065826-339

Suggest a fix/enhancement

public partial class MyJob : Job,  IEquatable<MyJob>, IValidatableObject
{
  public MyJob(...) : base(jobStatus: jobStatus)
}