Update version to 0.1.4.

R=pquitslund@google.com

Review URL: https://chromiumcodereview.appspot.com//942003005

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index 6029c09..8d6f4de 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dart_style
-version: 0.1.4-dev
+version: 0.1.4
 author: Dart Team <misc@dartlang.org>
 description: Opinionated, automatic Dart source code formatter.
 homepage: https://github.com/dart-lang/dart_style