prow/plugins/approve/approvers/owners.go
func (ap *Approvers) AddAssignees(logins ...string) {
	for _, login := range logins {
		ap.assignees.Insert(strings.ToLower(login))
	}
}
func (ap *Approvers) AddAssignees(logins ...string) {
	for _, login := range logins {
		ap.assignees.Insert(strings.ToLower(login))
	}
}
// AddAssignees adds assignees to the list