support node v12

packages/growi-commons/package.json

@@ -54,7 +54,7 @@
     ]
   },
   "engines": {
-    "node": ">=8.11.1 <11",
+    "node": ">=8.11.1 <13",
     "npm": ">=5.6.0 <7",
     "yarn": ">=1.5.1 <2"
   }