Constrain lowest PHPParser version to 4.13.0

Author: ondrejmirtes

composer.json

@@ -10,6 +10,7 @@
 		"phpstan/phpstan": "^1.0"
 	},
 	"require-dev": {
+		"nikic/php-parser": "^4.13.0",
 		"php-parallel-lint/php-parallel-lint": "^1.2",
 		"phpstan/phpstan-phpunit": "^1.0",
 		"phpstan/phpstan-strict-rules": "^1.0",