Update Readme to Bot API 3.1

Author: Eleirbag89

README.md

@@ -1,5 +1,5 @@
 # TelegramBotPHP
-[![API](https://img.shields.io/badge/Telegram%20Bot%20API-May%2018%2C%202017-36ade1.svg)](https://core.telegram.org/bots/api)
+[![API](https://img.shields.io/badge/Telegram%20Bot%20API-June%2030%2C%202017-36ade1.svg)](https://core.telegram.org/bots/api)
 ![PHP](https://img.shields.io/badge/php-%3E%3D5.3-8892bf.svg)
 ![CURL](https://img.shields.io/badge/cURL-required-green.svg)
 
@@ -8,7 +8,7 @@
 [![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.
+> (Almost) Compliant with the June 30, 2017 Telegram Bot API update.
 
 Requirements
 ---------