Oh well, let's just make pub.dev happy (160p envy)

Fixed topics

Added relevant topics to `pubspec.yaml`.

Added `updateDataAsync` to `ResultNotifier`.

Removed `ResultNotifierProvider`.

Updated `ResourceProvider` to use `WatcherContext` instead of `BuildContext` (in builder and build), to make watching
  easier.

Fixed bad image URL in README.

Added "watch" functionality and more (see CHANGELOG.md).

Fixed issue with `Result.toData` (and thus `ResultNotifier.toData`) n…

…ot using the `data` parameter correctly.

Refactoring of ResultNotifier and added proper effects.

Added entry for 0.1.1