Get ready to publish 0.1.3.

R=pquitslund@google.com

Review URL: https://chromiumcodereview.appspot.com//875573007
diff --git a/pubspec.yaml b/pubspec.yaml
index 3163964..866e3bd 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dart_style
-version: 0.1.3-dev
+version: 0.1.3
 author: Dart Team <misc@dartlang.org>
 description: Opinionated, automatic Dart source code formatter.
 homepage: https://github.com/dart-lang/dart_style