attribution field is incorrect

[nkardos]

The attribution field is not a simple string, it has some attributes.
For example Boomerang is adding name attribute.

Suggested fix in InstagramResponse.cs:
public attribution attribution { get; set; }
public class attribution
{
public string website { get; set; }
public string itunes_url { get; set; }
public string name { get; set; }
}