Removed conflict from composer.json

Because it broke Codeception builds

Author: Naktibalda

composer.json

@@ -14,8 +14,5 @@
     },
     "require-dev": {
         "phpunit/phpunit": ">=4.8 <8.0"
-    },
-    "conflict": {
-        "codeception/codeception": "<2.4"
     }
 }