Update charted to 0.4.8 and roll

packages/quiver_iterables/lib/src/zip.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.
-
-part of quiver.iterables;
-
-/// Returns an [Iterable] of [List]s where the nth element in the returned
-/// iterable contains the nth element from every Iterable in [iterables]. The
-/// returned Iterable is as long as the shortest Iterable in the argument. If
-/// [iterables] is empty, it returns an empty list.
-Iterable<List> zip(Iterable<Iterable> iterables) sync* {
-  if (iterables.isEmpty) return;
-  var iterators = iterables.map((i) => i.iterator).toList(growable: false);
-  while (true) {
-    var zipped = new List(iterators.length);
-    for (var i = 0; i < zipped.length; i++) {
-      if (!iterators[i].moveNext()) return;
-      zipped[i] = iterators[i].current;
-    }
-    yield zipped;
-  }
-}