Update to v0.2.0-rc.2.

R=nweiz@google.com

Review URL: https://chromiumcodereview.appspot.com//1254063002 .
diff --git a/pubspec.yaml b/pubspec.yaml
index 87b9e9e..ab2e774 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dart_style
-version: 0.2.0-rc.2.dev
+version: 0.2.0-rc.2
 author: Dart Team <misc@dartlang.org>
 description: Opinionated, automatic Dart source code formatter.
 homepage: https://github.com/dart-lang/dart_style