Updated charted DEP to 0.4.X

packages/charted/lib/charts/behaviors/axis_label_tooltip.dart

Index: packages/charted/lib/charts/behaviors/axis_label_tooltip.dart
diff --git a/packages/charted/lib/charts/behaviors/axis_label_tooltip.dart b/packages/charted/lib/charts/behaviors/axis_label_tooltip.dart
index 092db6bd47de6cf1aed9d0c4776c104bfc7a7867..43c950b56ee16d7367e261c2964505ba14ad66b3 100644
--- a/packages/charted/lib/charts/behaviors/axis_label_tooltip.dart
+++ b/packages/charted/lib/charts/behaviors/axis_label_tooltip.dart
@@ -38,8 +38,8 @@ class AxisLabelTooltip implements ChartBehavior {
   void _subscribe() {
     var elements = _area.host.querySelectorAll(_AXIS_SELECTOR);
     _disposer.dispose();
-    _disposer
-        .addAll(elements.map((x) => x.onMouseOver.listen(_handleMouseOver)));
+    _disposer.addAll(
+        elements.map((Element x) => x.onMouseOver.listen(_handleMouseOver)));
     _disposer.addAll(elements.map((x) => x.onMouseOut.listen(_handleMouseOut)));
   }
 
@@ -88,7 +88,7 @@ class AxisLabelTooltip implements ChartBehavior {
   void ensureRenderAreaRect() {
     var layout = _area.layout;
     _hostAreaRect = _area.host.getBoundingClientRect();
-    _renderAreaRect = new math.Rectangle(
+    _renderAreaRect = new math.Rectangle<num>(
         _hostAreaRect.left + layout.chartArea.x + layout.renderArea.x,
         _hostAreaRect.top + layout.chartArea.y + layout.renderArea.y,
         layout.renderArea.width,