FlatCompat utility needs documentation (or has wrong documentation)

[matthew-dean]

Even though the documentation says that recommendedConfig is optional, I'm getting this error for ESLint:

TypeError: Missing parameter 'recommendedConfig' in FlatCompat constructor

I think this is because a Nuxt config uses a non-flat file and is using 'eslint:recommended'. But the documentation doesn't make clear when you would / would not need that option.

[aladdin-add]

Duplicate of #127

and I agreed the docs can be improved.

[nzakas]

Yeah, you only get that error if a config is using eslint:recommended. I'll update the README.