Update README.md

Author: Igor Chepurnoy

README.md

@@ -3,6 +3,7 @@ Selectize Widget for Yii 2
 Widget based on selectize.js extension http://brianreavis.github.io/selectize.js/
 
 [![Latest Stable Version](https://poser.pugx.org/yii2mod/yii2-selectize/v/stable)](https://packagist.org/packages/yii2mod/yii2-selectize) [![Total Downloads](https://poser.pugx.org/yii2mod/yii2-selectize/downloads)](https://packagist.org/packages/yii2mod/yii2-selectize) [![License](https://poser.pugx.org/yii2mod/yii2-selectize/license)](https://packagist.org/packages/yii2mod/yii2-selectize)
+[![Build Status](https://travis-ci.org/yii2mod/yii2-selectize.svg?branch=master)](https://travis-ci.org/yii2mod/yii2-selectize)
 
 Installation 
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