Downgraded does_not_include_dot_file.dart to 2.10 (#3027)
diff --git a/test/lish/does_not_include_dot_file.dart b/test/lish/does_not_include_dot_file.dart
index 91b9245..2fbac9f 100644
--- a/test/lish/does_not_include_dot_file.dart
+++ b/test/lish/does_not_include_dot_file.dart
@@ -2,6 +2,8 @@
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
+// @dart=2.10
+
import 'dart:convert';
import 'package:shelf/shelf.dart' as shelf;
