Update charted to 0.4.8 and roll

packages/quiver/test/async/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;
+library quiver.async.enumerate_test;
 
 import 'dart:async';
 
 import 'package:test/test.dart';
-import 'package:quiver/streams.dart';
+import 'package:quiver/async.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]);
     });
   });
 }