prow/plugins/approve/approvers/owners.go
func (ap *Approvers) RemoveApprover(login string) {
	delete(ap.approvers, strings.ToLower(login))
}
func (ap *Approvers) RemoveApprover(login string) {
	delete(ap.approvers, strings.ToLower(login))
}
// RemoveApprover removes an approver from the list.