Update charted to 0.4.8 and roll

packages/quiver/test/async/countdown_timer_test.dart

Index: packages/quiver/test/async/countdown_timer_test.dart
diff --git a/packages/quiver/test/async/countdown_timer_test.dart b/packages/quiver/test/async/countdown_timer_test.dart
index ea6b8f693cc04e2342f9b1c975b6a42207a2558a..500dd9944c1a8ab769353f1ad425757aefaac93b 100644
--- a/packages/quiver/test/async/countdown_timer_test.dart
+++ b/packages/quiver/test/async/countdown_timer_test.dart
@@ -28,9 +28,10 @@ main() {
         var stopwatch = new FakeStopwatch(
             () => 1000 * clock.now().millisecondsSinceEpoch, 1000000);
 
-        var timings = new CountdownTimer(
-            new Duration(milliseconds: 500), new Duration(milliseconds: 100),
-            stopwatch: stopwatch).map((c) => c.remaining.inMilliseconds);
+        var timings = new CountdownTimer(const Duration(milliseconds: 500),
+                const Duration(milliseconds: 100),
+                stopwatch: stopwatch)
+            .map((c) => c.remaining.inMilliseconds);
 
         List<int> result;
         timings.toList().then((list) {
@@ -41,5 +42,11 @@ main() {
         expect(result, [400, 300, 200, 100, 0]);
       });
     });
+
+    test('should set increment to the initialized value', () {
+      var timer = new CountdownTimer(
+          const Duration(milliseconds: 321), const Duration(milliseconds: 123));
+      expect(timer.increment, const Duration(milliseconds: 123));
+    });
   });
 }