Update charted to 0.4.8 and roll

packages/yaml/lib/src/equality.dart

Index: packages/yaml/lib/src/equality.dart
diff --git a/packages/yaml/lib/src/equality.dart b/packages/yaml/lib/src/equality.dart
index 540813599c1f19c5d3b150749f6fb441bcd8a4dd..846f7168ad22d458b253ceb919d57219b2476d14 100644
--- a/packages/yaml/lib/src/equality.dart
+++ b/packages/yaml/lib/src/equality.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library yaml.equality;
-
 import 'dart:collection';
 
 import 'package:collection/collection.dart';
@@ -11,7 +9,8 @@ import 'package:collection/collection.dart';
 import 'yaml_node.dart';
 
 /// Returns a [Map] that compares its keys based on [deepEquals].
-Map deepEqualsMap() => new HashMap(equals: deepEquals, hashCode: deepHashCode);
+Map/*<K, V>*/ deepEqualsMap/*<K, V>*/() =>
+    new HashMap(equals: deepEquals, hashCode: deepHashCode);
 
 /// Returns whether two objects are structurally equivalent.
 ///