Update charted to 0.4.8 and roll

packages/quiver/test/streams/enumerate_test.dart

-// Copyright 2014 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.enumerate_test;
-
-import 'dart:async';
-
-import 'package:test/test.dart';
-import 'package:quiver/streams.dart';
-
-main() {
-  group('enumerate', () {
-    test('should add indices to its argument', () {
-      var controller = new StreamController<String>();
-      var enumerated = enumerate(controller.stream);
-      var expectation = enumerated.toList().then((e) {
-        expect(e.map((v) => v.index), [0, 1, 2]);
-        expect(e.map((v) => v.value), ['a', 'b', 'c']);
-      });
-      ['a', 'b', 'c'].forEach(controller.add);
-      return Future.wait([controller.close(), expectation]);
-    });
-  });
-}