Increase CS fixer version

Author: Toflar

composer.json

@@ -18,7 +18,7 @@
         "symfony/options-resolver": "^3.0|^4.0|^5.0"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^2.12",
+        "friendsofphp/php-cs-fixer": "^2.16.1",
         "symfony/phpunit-bridge": "^4.3.5",
         "php-coveralls/php-coveralls": "^2.1"
     },