Prepare to release 0.14.0 (#94)

diff --git a/pubspec.yaml b/pubspec.yaml
index 92e502e..81dcae9 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: html
-version: 0.14.0-dev
+version: 0.14.0
 
 description: APIs for parsing and manipulating HTML content outside the browser.
 author: Dart Team <misc@dartlang.org>