Update charted to 0.4.8 and roll

packages/charted/lib/charts/src/chart_config_impl.dart

 //
 // Copyright 2014 Google Inc. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 //
 
 part of charted.charts;
 
-class DefaultChartConfigImpl extends ChangeNotifier implements ChartConfig {
+class DefaultChartConfigImpl extends Observable implements ChartConfig {
   final Map<String, ChartAxisConfig> _measureAxisRegistry = {};
   final Map<int, ChartAxisConfig> _dimensionAxisRegistry = {};
   final SubscriptionsDisposer _disposer = new SubscriptionsDisposer();
 
   bool _isRTL = false;
   Iterable<ChartSeries> _series;
   Iterable<int> _dimensions;
   StreamSubscription _dimensionsSubscription;
 
   @override
@@ skipping 81 matching lines @@
     }
   }
 
   @override
   Iterable<int> get dimensions => _dimensions;
 
   @override
   void registerMeasureAxis(String id, ChartAxisConfig config) {
     assert(config != null);
     _measureAxisRegistry[id] = config;
+    notifyChange(const ChartConfigChangeRecord());
   }
 
   @override
   ChartAxisConfig getMeasureAxis(String id) => _measureAxisRegistry[id];
 
   @override
   void registerDimensionAxis(int column, ChartAxisConfig config) {
     assert(config != null);
     assert(dimensions.contains(column));
     _dimensionAxisRegistry[column] = config;
+    notifyChange(const ChartConfigChangeRecord());
   }
 
   @override
   ChartAxisConfig getDimensionAxis(int column) =>
       _dimensionAxisRegistry[column];
 
   @override
   set isRTL(bool value) {
     if (_isRTL != value && value != null) {
       _isRTL = value;
       notifyChange(const ChartConfigChangeRecord());
     }
   }
 
   @override
   bool get isRTL => _isRTL;
 }