title: Slack replace message with ephemeral response_type to in_channel
body: <p>I'm trying to integrate some interactive actions to slack app.
  one of steps - give user ability to select one or several options, which should be visible just for him.</p>
  
  <p>It works good with <code>response_type=ephemeral</code>
  but in the end everyone have to see message, and replace <code>response_type</code> to <code>in_channel</code> doesn't give any result</p>