Issue Notes: record assignee changes in the comment timeline
Created by: PixnBits
as proposed in http://feedback.gitlab.com/forums/176466-general/suggestions/5168130-record-assignee-changes-in-the-comment-timeline
Created by: PixnBits
as proposed in http://feedback.gitlab.com/forums/176466-general/suggestions/5168130-record-assignee-changes-in-the-comment-timeline