Update charted to 0.4.8 and roll

packages/intl/test/date_time_format_uninitialized_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
-/**
- * Tests date formatting and parsing using locale data read from the
- * local file system.
- */
+/// Tests date formatting and parsing using locale data read from the
+/// local file system.
 library date_time_format_file_test;
 
 import 'date_time_format_test_core.dart';
 
 main() {
   runDateTests(() => ['en_US']);
 }