Contact Get Requests does not return 'CreatedAt' and 'UpdatedAt'

[SteDuk]

Describe the bug
When requesting the contacts list or a single contact by Id I do not get any value for CreatedAt and UpdatedAt

Repro Steps
`var api = new HubSpotApi("Access token here")

        var contact = api.Contact.GetById<ContactHubSpotModel>(request.Id);

        return new ContactsDetailsResponse
        {
            Company = contact.Company,
            Email = contact.Email,
            FirstName = contact.FirstName,
            LastName = contact.LastName,
            Id = contact.Id,
            Phone = contact.Phone,
            CreatedAt = contact.CreatedAt,
            UpdatedAt = contact.UpdatedAt
        };`

Expected behavior
Should return the Contact object including CreaetdAt and UpdatedAt

[SteDuk]

It seems, that the DataMember Name of these Properties are outdated.

Workaround
I created a class which inherits from ContactHubSpotModel:

public class MyHubspotContact : ContactHubSpotModel
    {
        [DataMember(Name = "createdate")]
        public DateTime? CreateDate { get; set; }

        [DataMember(Name = "lastmodifieddate")]
        public DateTime? UpdateDate { get; set; }
    }