natives dependency deprecated by its maintainer

After running `npm install --save-dev approvals`,
I get this message: 
`npm WARN deprecated natives@1.1.6: 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.`

Apparently natives is a dependency of approvals. It seems deprecated by its maintainer, see https://github.com/isaacs/natives 