Reminder: after update to ESLint v6, dissalow 'allow require for configs' for nested configs

[threequartersjohn]

When this package updates to version 6 of ESLint, we must update our override for .config.js files to disallow that same override for nested .config.js files.

This override can be found here.

The update is probably going to be something like:

'files': './*.config.js'

[satazor]

Fixed in master.