To automate maintenance of dependency versions in `express-cli.js`

Right now the generation of the `package.json` to scaffold with its corresponding dependencies has hard-coded values of the names of the packages to use and its corresponding version.

This implies a manual maintenance of the version of the packages whenever there is a new release. This can be specially critical to not scaffold to users packages with vulnerabilities (which are already fixed in greater versions).

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I would like to discuss a solution for this and also, I would be open to participate with my first contribution on this repository if possible :)