Change the status of an attendance for an event specified by id

[j1jlee]

Change the status of an attendance for an event specified by id

Change the status of an attendance for an event specified by id.

• An authenticated user is required for a successful response
• Only the owner of the group or a member of the group with a membership
  status of "co-host" is authorized to change the status of a membership
• Attendance record is updated in the database after request
• Success response includes the id eventId, userId, and the new
  status
• Error response with status 404 is given when an event does not exist with
  the provided id
• Error response with status 400 is given when changing the status to
  "pending"
• Error response with status 403 is given when changing the status to
  "attending" when the current user is not the organizer or a co-host
• Error response with status 404 is given when an attendance between the
  user and event does not exist