Notifications for Outdated / At-Risk Node Versions

[charlespierce]

It would be good to show a notification (perhaps on a once-per-day schedule) when a version of Node that is being used is out-of-date, or at least when it has an active security problem and needs to be upgraded.

This is especially important for package installs, since we pin a version of node to use with those tools, so in theory that version could remain for a long time.

[charlespierce]

Suggested by @BryanHunt in #837: An alternative would be to have a command that will show any outdated, possibly modeled after yarn outdated.

[linux-china]

Now I use npm-check -g to check outdated packages installed by Volta.

[linux-china]

Update outdated packages:

npm-check -g |grep global |grep install | awk '{print $4}' | xargs -n 1 volta install