Change the status of a membership for a group specified by id

[j1jlee]

Change the status of a membership for a group specified by id

Change the status of a membership for a group 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
• Membership record is updated in the database after request
• Success response includes the id groupId, memberId, and the new
  status
• Error response with status 404 is given when a group does not exist with
  the provided id
• Error response with status 403 is given when changing the status to
  "co-host" when the current user is not the group organizer
• Error response with status 403 is given when changing the status to
  "member" when the current user is not the group organizer
  or a co-host
• Error response with status 400 is given when changing the status to
  "pending"
• Error response with status 404 is given when a membership between the user
  and group does not exist