symfony/lock 추가

composer.json

@@ -16,7 +16,8 @@
         "firephp/firephp-core": "^0.4.0",
         "vlucas/valitron": "^1.4",
         "php-extended/php-tail": "^2.1",
-        "pguardiario/phpuri": "^1.0"
+        "pguardiario/phpuri": "^1.0",
+        "symfony/lock": "^3.4"
     },
     "autoload": {
         "psr-4": {