Update the pubspec's homepage link.

pkgs/watcher/pubspec.yaml

diff --git a/pkgs/watcher/pubspec.yaml b/pkgs/watcher/pubspec.yaml
index 6f96a56..658ef78 100644
--- a/pkgs/watcher/pubspec.yaml
+++ b/pkgs/watcher/pubspec.yaml
@@ -1,7 +1,7 @@
 name: watcher
 version: 0.9.3
 author: Dart Team <misc@dartlang.org>
-homepage: http://www.dartlang.org
+homepage: http://github.com/dart-lang/watcher
 description: >
   A file system watcher. It monitors changes to contents of directories and
   sends notifications when files have been added, removed, or modified.