Update the pubspec's homepage link.

pkgs/string_scanner/pubspec.yaml

diff --git a/pkgs/string_scanner/pubspec.yaml b/pkgs/string_scanner/pubspec.yaml
index da93ead..2a712b8 100644
--- a/pkgs/string_scanner/pubspec.yaml
+++ b/pkgs/string_scanner/pubspec.yaml
@@ -1,7 +1,7 @@
 name: string_scanner
 version: 0.1.3
 author: "Dart Team <misc@dartlang.org>"
-homepage: http://www.dartlang.org
+homepage: http://github.com/dart-lang/string_scanner
 description: >
   A class for parsing strings using a sequence of patterns.
 dependencies: