Update README.md

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Author: murilolobato

README.md

@@ -60,7 +60,7 @@ Supports cross-domain, chunked and resumable file uploads and client-side image
 * [Bootstrap](http://getbootstrap.com/) v. 3.2.0+
 * [Glyphicons](http://glyphicons.com/)
 
-The user interface of all versions, except the jQuery UI version, are built with [Bootstrap](http://getbootstrap.com/) and icons from [Glyphicons](http://glyphicons.com/).
+The user interface of all versions, except the jQuery UI version, is built with [Bootstrap](http://getbootstrap.com/) and icons from [Glyphicons](http://glyphicons.com/).
 
 ### Cross-domain requirements
 [Cross-domain File Uploads](https://github.com/blueimp/jQuery-File-Upload/wiki/Cross-domain-uploads) using the [Iframe Transport plugin](https://github.com/blueimp/jQuery-File-Upload/blob/master/js/jquery.iframe-transport.js) require a redirect back to the origin server to retrieve the upload results. The [example implementation](https://github.com/blueimp/jQuery-File-Upload/blob/master/js/main.js) makes use of [result.html](https://github.com/blueimp/jQuery-File-Upload/blob/master/cors/result.html) as a static redirect page for the origin server.