README.md: add version badge

diff --git a/README.md b/README.md
index 00e2020..fe0f6d6 100644 (file)
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
+[![NPM version](https://badge.fury.io/js/clean-css.png)](http://badge.fury.io/js/clean-css)
 [![Build Status](https://secure.travis-ci.org/GoalSmashers/clean-css.png)](http://travis-ci.org/GoalSmashers/clean-css)
 [![Dependency Status](https://gemnasium.com/GoalSmashers/clean-css.png)](https://gemnasium.com/GoalSmashers/clean-css)