Analysis failure fix

webdev/bin/webdev.dart

diff --git a/webdev/bin/webdev.dart b/webdev/bin/webdev.dart
index 42d8d6c..64b76c0 100644
--- a/webdev/bin/webdev.dart
+++ b/webdev/bin/webdev.dart
@@ -9,6 +9,7 @@
 import 'package:args/command_runner.dart';
 import 'package:io/ansi.dart';
 import 'package:io/io.dart';
+// ignore: import_of_legacy_library_into_null_safe
 import 'package:webdev/src/command/configuration.dart';
 import 'package:webdev/src/webdev_command_runner.dart';