title: Adding multiple CC's using Zenpy
body: <p>I am working on an automation script to push out emails based on tickets we receive from our CRM.</p>
  <p>Is there a way for the collaborator_ids to take multiple emails? I've tried using email_ccs and email_ccs_ids with no luck. Below is what I am currently using to include one CC'd email address.</p>
  <pre><code>zenpy_client.tickets.update(Ticket(id=i.id, requester=User(email=roster_email, name=name), collaborator_ids=cc_email))
  </code></pre>
  <p>I've also tried: <code>collaborator_ids=(cc_email, cc_email2)</code></p>