Updated charted DEP to 0.4.X

packages/charted/lib/core/scales/ordinal_scale.dart

Index: packages/charted/lib/core/scales/ordinal_scale.dart
diff --git a/packages/charted/lib/core/scales/ordinal_scale.dart b/packages/charted/lib/core/scales/ordinal_scale.dart
index 718966aa3187c65d548bf80b0a126c2897e36a4f..695f951b5dcd9ad72fb9bbd92f9cc9d8a8955e1c 100644
--- a/packages/charted/lib/core/scales/ordinal_scale.dart
+++ b/packages/charted/lib/core/scales/ordinal_scale.dart
@@ -39,7 +39,7 @@ class _OrdinalScale implements OrdinalScale {
   }
 
   @override
-  dynamic invert(num value) {
+  dynamic invert(value) {
     int position = _range.indexOf(value);
     return position > -1 && position < _domain.length
         ? _domain[position]
@@ -94,7 +94,8 @@ class _OrdinalScale implements OrdinalScale {
   num get rangeBand => _rangeBand;
 
   @override
-  FormatFunction createTickFormatter([String format]) => identityFunction;
+  FormatFunction createTickFormatter([String format]) =>
+      (String s) => identityFunction/*<String>*/(s);
 
   @override
   Iterable get ticks => _domain;
@@ -153,8 +154,9 @@ class _OrdinalScale implements OrdinalScale {
     scale._reset = (_OrdinalScale s) {
       var start = range.first,
           stop = range.last,
-          step = ((stop - start) /
-              (s.domain.length - padding + 2 * outerPadding)).floor(),
+          step =
+          ((stop - start) / (s.domain.length - padding + 2 * outerPadding))
+              .floor(),
           error = stop - start - (s.domain.length - padding) * step;
 
       s._range = s._steps(start + (error / 2).round(), step);