gulp-util is deprecated

`npm WARN deprecated gulp-util@3.0.8: gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
`

I am following the direction on this link (https://os.mbed.com/javascript-on-mbed/). After I type `npm install`, I get the message above, along with the following error message:

```
npm WARN deprecated graceful-fs@3.0.11: please upgrade to graceful-fs 4 for compatibility with current and future versions of Node.js
npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated minimatch@0.2.14: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated graceful-fs@1.2.3: please upgrade to graceful-fs 4 for compatibility with current and future versions of Node.js
npm WARN deprecated natives@1.1.3: This module relies on Node.js's internals and will break at some point. Do not use it, and update to graceful-fs@4.x.

```

How can we fix this?

Start by running `npm install` as described and compare the reported deprecated packages with the dependency definitions in the repository. Done means installation no longer reports the listed gulp-util, graceful-fs, minimatch, or natives deprecations and completes without the reported errors.

Written by the indexing model from the issue text.