Fix analysis warrnings

lib/src/widgets/quill/quill_controller.dart

@@ -2,11 +2,11 @@ import 'dart:math' as math;
 
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
-import '../../../quill_delta.dart';
 import 'package:html2md/html2md.dart' as html2md;
 import 'package:markdown/markdown.dart' as md;
 
 import '../../../markdown_quill.dart';
+import '../../../quill_delta.dart';
 import '../../models/documents/attribute.dart';
 import '../../models/documents/document.dart';
 import '../../models/documents/nodes/embeddable.dart';