Upgrade npm

Overview When attempting to install newer packages on v6+ platforms, npm may complain that it is too old to install a package. Sample error: Sails.js Installation – Error ——————————————————– Your npm-Version is too old: Sails require npm >= 1.4.0 (you currently have 1.3.6) Please update the installed npm (Node Package Manager) to install Sails. ——————————————————–…