Simplified factory to create an for Mailchimp.

- `Anything`
  - `Object`
    - `Basic` ...and other supertypes
      - `MailchimpAuth`

- `MailchimpAuth`
  - `Basic`
    - `Identifiable`
    - `Object`
      - `Anything`

no subtypes hierarchy

Initializer
`MailchimpAuth(MailchimpAuth unknown)`

Inherited Attributes
Attributes inherited from: `Object` `hash`, `string`

Inherited Methods
Methods inherited from: `Object` `equals`