Fix shiels.io badge version number.

Author: Florian Kissling

README.md

@@ -1,5 +1,5 @@
 A [Select2](https://select2.github.io/) v4 [Theme](https://select2.github.io/examples.html#themes) for Bootstrap 3  
-![select2-bootstrap-theme version](https://img.shields.io/badge/select2--bootstrap--theme-v0.1.0--beta.9-brightgreen.svg)
+![select2-bootstrap-theme version](https://img.shields.io/badge/select2--bootstrap--theme-v0.1.0--beta.10-brightgreen.svg)
 [![License](http://img.shields.io/badge/License-MIT-blue.svg)](http://opensource.org/licenses/MIT)
 
 Demonstrations available at