add build, version and license icons to readme

README.md

@@ -3,7 +3,19 @@
   <img src="https://avatars0.githubusercontent.com/u/38423357?s=200&v=4"/>
  </a>
 </p>
-<h1 align="center">Sorting Plugin</h1>
+<h1 align="center">
+Sorting Plugin
+<br />
+ <a href="https://packagist.org/packages/mangoweb-sylius/sylius-sorting-plugin" title="License" target="_blank">
+  <img src="https://img.shields.io/packagist/l/mangoweb-sylius/sylius-sorting-plugin.svg" />
+ </a>
+ <a href="https://packagist.org/packages/mangoweb-sylius/sylius-sorting-plugin" title="Version" target="_blank">
+  <img src="https://img.shields.io/packagist/v/mangoweb-sylius/sylius-sorting-plugin.svg" />
+ </a>
+ <a href="http://travis-ci.org/mangoweb-sylius/SyliusSortingPlugin" title="Build status" target="_blank">
+  <img src="https://img.shields.io/travis/mangoweb-sylius/SyliusSortingPlugin/master.svg" />
+ </a>
+</h1>
 
 ## Features