Added missing fields to Whois Object

Resolves #125 

Added the following fields to `WhoisObjectType`:
* `Lookup_Date`
* `Remarks`

Added the following fields to `WhoisContactType`:
* `Fax_Number`
* `Organization`

Issue #125 states that `Contact_Fax` and `Contact_Organization` fields should be added to `WhoisRegistrantInfoType` which is just an extension of `WhoisContactType`. Because of the extension, I added the fields to `WhoisContactType`. I changed the requested field names to align with the existing naming conventions (e.g., there is a `Phone_Number` field, so I renamed `Contact_Fax` to `Fax_Number`).