Prepare to publish, tighten pub constraints (dart-lang/watcher#81)

- Add a changelog entry.
- Remove unused author key from pubspec.
- Tighten the constraints on dependencies for any which had a lower
  major version bound than the package versions which support Dart 2.
2 files changed
tree: c2a4253bcd32a9c770129c5dffa1bf7b0dea3163
  1. pkgs/