pkg/watcher: prepare for 0.9.3

added changelog
updated pubspec
code formatting
removed unused imports

R=ajohnsen@google.com

Review URL: https://codereview.chromium.org//441483004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/watcher@38862 260f80e4-7a28-3924-810f-c04153c831b5
21 files changed
tree: a66e4580fc3cf789ae2a589bce772bf9c78d42c4
  1. example/
  2. lib/
  3. test/
  4. CHANGELOG.md
  5. LICENSE
  6. pubspec.yaml
  7. README.md
README.md

A file watcher. It monitors (currently by polling) for changes to contents of directories and notifies you when files have been added, removed, or modified.