Drop dependency on nikic/php-parser

Author: ondrejmirtes

composer.json

@@ -21,7 +21,6 @@
     "symfony/framework-bundle": "<3.0"
   },
   "require-dev": {
-    "nikic/php-parser": "^4.13.0",
     "php-parallel-lint/php-parallel-lint": "^1.2",
     "phpstan/phpstan-phpunit": "^2.0",
     "phpstan/phpstan-strict-rules": "^2.0",