Update charted to 0.4.8 and roll

packages/charted/lib/core/utils/lists.dart

Index: packages/charted/lib/core/utils/lists.dart
diff --git a/packages/charted/lib/core/utils/lists.dart b/packages/charted/lib/core/utils/lists.dart
index 02689a965f3df58936e735d8385dfe075195d481..eb9d3c5d7547cb35c1f316f9d10961c30322d140 100644
--- a/packages/charted/lib/core/utils/lists.dart
+++ b/packages/charted/lib/core/utils/lists.dart
@@ -14,14 +14,14 @@ num sum(List values) => values == null || values.isEmpty
     : values.fold(0.0, (old, next) => old + next);
 
 /// Returns the smallest number in the given list of values
-num min(Iterable values) => values == null || values.isEmpty
+num min(Iterable<num> values) => values == null || values.isEmpty
     ? null
-    : values.fold(values.elementAt(0), math.min);
+    : values.fold(values.elementAt(0), (x, y) => math.min(x, y));
 
 /// Returns the largest number in the given list of values
-num max(Iterable values) => values == null || values.isEmpty
+num max(Iterable<num> values) => values == null || values.isEmpty
     ? null
-    : values.fold(values.elementAt(0), math.max);
+    : values.fold(values.elementAt(0), (x, y) => math.max(x, y));
 
 /// Represents a constant pair of values
 class Pair<T1, T2> {