fix(package): update dateformat to version 3.0.0

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
   },
   "dependencies": {
     "async": "^2.0.0",
-    "dateformat": "^2.0.0",
+    "dateformat": "^3.0.0",
     "elasticsearch": "^12.0.1",
     "optimist": "^0.6.1",
     "request": "^2.73.0",