Uses stable version of codeception

Author: Anton Shevchuk

README.md

@@ -2,6 +2,8 @@ Bluz, a lightweight PHP Framework
 =================================
 Easy to setup, easy to use.
 
+[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/bluzphp/main)
+
 ## Achievements
 [![PHP >= 7.1+](https://img.shields.io/packagist/php-v/bluzphp/framework.svg?style=flat)](https://php.net/)
 

composer.json

@@ -14,7 +14,7 @@
         "zendframework/zend-httphandlerrunner": "~1.0"
     },
     "require-dev": {
-        "codeception/codeception": "2.5.3",
+        "codeception/codeception": "~2.5.3",
         "php-coveralls/php-coveralls": "~2.1",
         "squizlabs/php_codesniffer": "~3.3",
         "phploc/phploc": "~4.0"