I wrote a [script](https://github.com/j0lv3r4/dependency-version-updater) to update dependencies recursively in `package.json` files, e.g.:
```
$ node index.js --path="./examples" --dependencies="react=^16.7.0,react-dom=^16.7.0"
```
This PR contains the result against the examples folder.
I simplified the example by removing `.eslintrc.js` and related packages, as well as `nodemon`.
I also added a description in the README to address the question by @kachkaev in the original pull request (#4163).
