Upgrade NPM to version 2.11.2

[corvy]

The new release includes new functionality like the ability to do geofencing based on IP.
NginxProxyManager/docker-nginx-full#28

More infomation here: NginxProxyManager/nginx-proxy-manager#46 (comment)

Hope this could be considered :) 👍

[tjorim]

This is a feature request, not an issue. PR #526 is already created to update the NPM version.