Update charted to 0.4.8 and roll

packages/quiver/test/iterables/concat_test.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.iterables.concat_test;
 
 import 'package:test/test.dart';
 import 'package:quiver/iterables.dart';
 
 main() {
   group('concat', () {
     test('should handle empty input iterables', () {
       expect(concat([]), isEmpty);
     });
 
     test('should handle single input iterables', () {
-      expect(concat([[1, 2, 3]]), [1, 2, 3]);
+      expect(
+          concat([
+            [1, 2, 3]
+          ]),
+          [1, 2, 3]);
     });
 
     test('should chain multiple input iterables', () {
-      expect(concat([[1, 2, 3], [-1, -2, -3]]), [1, 2, 3, -1, -2, -3]);
+      expect(
+          concat([
+            [1, 2, 3],
+            [-1, -2, -3]
+          ]),
+          [1, 2, 3, -1, -2, -3]);
     });
 
     test('should throw for null input', () {
       expect(() => concat(null), throws);
     });
 
     test('should throw if any input is null', () {
-      expect(() => concat([[1, 2], null, [3, 4]]).toList(), throws);
+      expect(
+          () => concat([
+                [1, 2],
+                null,
+                [3, 4]
+              ]).toList(),
+          throws);
     });
 
     test('should reflectchanges in the inputs', () {
       var a = [1, 2];
       var b = [4, 5];
       var ab = concat([a, b]);
       expect(ab, [1, 2, 4, 5]);
       a.add(3);
       b.add(6);
       expect(ab, [1, 2, 3, 4, 5, 6]);
     });
   });
 }