Update charted to 0.4.8 and roll

packages/quiver/test/async/stream_router_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,
@@ skipping 42 matching lines @@
           expect(e, 'baz');
         });
       controller.add('baz');
       return controller.close();
     });
 
     test('should close child streams', () {
       var controller = new StreamController<int>(sync: true);
       var router = new StreamRouter<int>(controller.stream);
       // toList() will only complete when the child streams are closed
-      var future = Future
-          .wait([
+      var future = Future.wait([
         router.route((e) => e % 2 == 0).toList(),
         router.route((e) => e % 2 == 1).toList(),
-      ])
-          .then((l) {
-        expect(l, [[4], [5]]);
+      ]).then((l) {
+        expect(l, [
+          [4],
+          [5]
+        ]);
       });
-      controller
-        ..add(4)
-        ..add(5);
+      controller..add(4)..add(5);
       router.close();
       return future;
     });
   });
 }