Removes a user from a private channel.

Required Params

• channel - Private channel to remove user from.
• user - User to remove from private channel.

Errors the API can return:

• cant_kick_self - You can't remove yourself from a group
• channel_not_found - Value passed for channel was invalid.
• not_in_group - User or caller were are not in the group
• restricted_action - A team preference prevents the authenticated user from kicking.
• user_not_found - Value passed for user was invalid.