Prepare for publishing (#103)

diff --git a/pubspec.yaml b/pubspec.yaml
index dc3e33b..d62ddde 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,5 @@
 name: observable
-version: 0.22.3-dev
-author: Dart Team <misc@dartlang.org>
+version: 0.23.0
 description: Support for marking objects as observable
 homepage: https://github.com/google/observable
 environment: