Update charted to 0.4.8 and roll

packages/source_span/lib/src/utils.dart

Index: packages/source_span/lib/src/utils.dart
diff --git a/packages/source_span/lib/src/utils.dart b/packages/source_span/lib/src/utils.dart
index fa0895784f2685639b311fe14b22d79a6429e9f7..69385476caaf64ad550335b0d2e893a575114fd3 100644
--- a/packages/source_span/lib/src/utils.dart
+++ b/packages/source_span/lib/src/utils.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library source_span.utils;
-
 /// Returns the minimum of [obj1] and [obj2] according to
 /// [Comparable.compareTo].
 Comparable min(Comparable obj1, Comparable obj2) =>