Merge remote-tracking branch 'upstream/develop' into scrutinizer_fixes

* upstream/develop:
  Added PHP version badge

README.md

@@ -8,6 +8,7 @@
 [![Latest Stable Version](https://img.shields.io/packagist/v/Longman/telegram-bot.svg)](https://packagist.org/packages/longman/telegram-bot)
 [![Total Downloads](https://img.shields.io/packagist/dt/Longman/telegram-bot.svg)](https://packagist.org/packages/longman/telegram-bot)
 [![Downloads Month](https://img.shields.io/packagist/dm/Longman/telegram-bot.svg)](https://packagist.org/packages/longman/telegram-bot)
+[![Minimum PHP Version](http://img.shields.io/badge/php-%3E%3D5.5.0-8892BF.svg)](https://php.net/)
 [![License](https://img.shields.io/packagist/l/Longman/telegram-bot.svg)](https://github.com/akalongman/php-telegram-bot/LICENSE.md)