deleteToOne method
Implementation
Future<RelationshipUpdated<ToOne>> deleteToOne(
String type, String id, String relationship,
{Map<String, String> headers = const {}}) async {
final response = await send(
baseUri.relationship(type, id, relationship),
Request.patch(OutboundDataDocument.one(ToOne.empty()))
..headers.addAll(headers));
return RelationshipUpdated.one(response.http, response.document);
}