Fix built with grunt image url.

README.md

@@ -50,7 +50,7 @@ bower install accruejs
 
 To contribute, you'll need [nodejs](http://nodejs.org/) and [Grunt](http://gruntjs.com/) installed. Fork and clone the repo, then visit the directory in the terminal and type `npm install`. After that you can simply run the `grunt` command to watch the files in the project. It'll automatically lint, test, compile, and minify the plugin files so you can just code.
 
-[![Built with Grunt](https://cdn.gruntjs.com/builtwith.png)](http://gruntjs.com/)
+[![Built with Grunt](https://gruntjs.com/cdn/builtwith.png)](http://gruntjs.com/)
 
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