require docblock parser

composer.json

@@ -20,6 +20,7 @@
     },
     "require": {
         "php": "^7.1",
+        "phpdocumentor/reflection-docblock": "^4.3",
         "psr/container": "^1.0",
         "symfony/cache": "^4.3",
         "symfony/serializer": "^4.3",