Update charted to 0.4.8 and roll

packages/quiver/test/streams/all_tests.dart

-// Copyright 2013 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-library quiver.streams.all_tests;
-
-import 'collect_test.dart' as collect;
-import 'concat_test.dart' as concat;
-import 'enumerate_test.dart' as enumerate;
-import 'streambuffer_test.dart' as streambuffer;
-
-main() {
-  collect.main();
-  concat.main();
-  enumerate.main();
-  streambuffer.main();
-}