fix(package): update xml2js to version 0.4.23

Closes #26

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
     "node-ip-location": "1.0.0",
     "public-ip": "3.1.0",
     "tunnel-agent": "0.6.0",
-    "xml2js": "0.4.19"
+    "xml2js": "0.4.23"
   },
   "devDependencies": {
     "ava": "2.0.0",