there is no assign method

[maxzod]

in the readme.md

import 'package:yaml_edit/yaml_edit.dart';

void main() {
  final yamlEditor = YamlEditor('{YAML: YAML}');
  yamlEditor.assign(['YAML'], "YAML Ain't Markup Language");
  print(yamlEditor);
  // Expected output:
  // {YAML: YAML Ain't Markup Language}
}

https://github.com/dart-lang/yaml_edit/blob/0ae689745e5796e12d77f93f7c2b2bfff7310489/README.md?plain=1#L14
but YamlEditor does not contains this method