Update charted to 0.4.8 and roll

packages/yaml/test.dart

-import 'package:yaml/yaml.dart';
-
-main() {
-  const src = """
-name: linter
-version: 0.0.1
-author: Dart Team <misc@dartlang.org>
-authors:
-  - Bill
-  - Ted
-description: Style linter for Dart.
-documentation:
-homepage: https://github.com/dart-lang/linter
-dependencies:
-  transmogrify:
-    hosted:
-      name: transmogrify
-      url: http://your-package-server.com
-    version: '>=0.4.0 <1.0.0'
-  analyzer: '0.24.0-dev.1'
-  cli_util: '>=0.0.1 <0.1.0'
-  semver: '>=0.2.0 <0.3.0'
-  yaml: '>=2.1.2 <3.0.0'
-  kittens:
-    git:
-      url: git://github.com/munificent/kittens.git
-      ref: some-branch
-  foo: any
-dev_dependencies:
-  markdown: '>=0.7.1+2 <0.8.0'
-  unittest: '>=0.11.0 <0.12.0'
-""";
-
-  YamlMap node = loadYamlNode(src, sourceUrl: null);
-  node.nodes.forEach((k, v) {
-    if (k is YamlScalar) print(k.span);
-  });
-}