[package] add dependency

Author: ar2rsawseen

package.json

@@ -47,6 +47,7 @@
     "express-session": "1.15.4",
     "external-ip": "1.3.1",
     "formidable": "1.1.1",
+    "fs.extra": "^1.3.2",
     "geoip-lite": "1.2.1",
     "jimp": "0.2.28",
     "jsdoc": "3.5.3",