updateAppliance method
Implementation
Future<Appliance> updateAppliance({
required Appliance appliance,
required Image image,
required String nickname,
}) async {
final requestData = {'image': image, 'nickname': nickname};
final response = await _post('appliances/${appliance.id}', data: requestData);
final json = jsonDecode(utf8.decode(response.bodyBytes));
final updated = Appliance.fromJson(json);
return updated;
}