package-lock.json file produced

[rlzijdeman]

Hi and thank you for the book!

In chapter 2 it reads: "If you're working with a fresh Node.js project, you can install the moment package like this:". But following the workflow of the book, at that point in the book, you just created your first project and executing the suggested code leads to a package-lock.json file and message: npm notice created a lockfile as package-lock.json. You should commit this file.

Please add 1 line on this behaviour explaining the message