Bump to 0.2.3.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//1593453002 .

bin/format.dart

diff --git a/bin/format.dart b/bin/format.dart
index f6fd6c9..84794dd 100644
--- a/bin/format.dart
+++ b/bin/format.dart
@@ -14,7 +14,7 @@
 import 'package:dart_style/src/source_code.dart';
 
 // Note: The following line of code is modified by tool/grind.dart.
-const version = "0.2.2";
+const version = "0.2.3";
 
 void main(List<String> args) {
   var parser = new ArgParser(allowTrailingOptions: true);

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index 160d378..ef995a4 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dart_style
-version: 0.2.3-dev
+version: 0.2.3
 author: Dart Team <misc@dartlang.org>
 description: Opinionated, automatic Dart source code formatter.
 homepage: https://github.com/dart-lang/dart_style