upgrade pedrotroller/php-cs-custom-fixer to 2.15.2 to fix a bug

Author: prisis

composer.json

@@ -22,7 +22,7 @@
     "require": {
         "php": "^7.1",
         "localheinz/php-cs-fixer-config": "1.15.*",
-        "pedrotroller/php-cs-custom-fixer": "^2.15.0"
+        "pedrotroller/php-cs-custom-fixer": "^2.15.2"
     },
     "require-dev": {
         "phpstan/phpstan": "^0.10.3",