Add StyleCI badge

Author: Eleirbag89

README.md

@@ -5,6 +5,7 @@
 
 [![Total Downloads](https://poser.pugx.org/eleirbag89/telegrambotphp/downloads)](https://packagist.org/packages/eleirbag89/telegrambotphp)
 [![License](https://poser.pugx.org/eleirbag89/telegrambotphp/license)](https://packagist.org/packages/eleirbag89/telegrambotphp)
+[![StyleCI](https://styleci.io/repos/38492095/shield?branch=master)](https://styleci.io/repos/38492095)
 
 > A very simple PHP [Telegram Bot API](https://core.telegram.org/bots) for sending messages.    
 > (Almost) Compliant with the May 18, 2017 Telegram Bot API update.