Fixed build

Author: ondrejmirtes

composer.json

@@ -12,6 +12,7 @@
 "require": {
 "php": "~7.1",
 "phpstan/phpstan": "^0.11",
+"phpstan/phpdoc-parser": "^0.3",
 "nikic/php-parser": "^4.0"
 },
 "require-dev": {