Use stable version of Doctrine CS

Author: lcobucci

composer.json

@@ -11,7 +11,7 @@
     ],
     "require": {
         "php": "^7.2",
-        "doctrine/coding-standard": "^5.0-dev"
+        "doctrine/coding-standard": "^5.0"
     },
     "require-dev": {
         "roave/security-advisories": "dev-master"