FIxed recommended config for legacy eslintrc config format

[ihordiachenko]

Fix #35 by splitting the recommended preset for flat config(ESLint 9) and legacy erslintrc config(ESLint < 9).

Usage in eslintrc remains the same. Usage in flat configs will looks like this:

const pluginChaiFriendly = require("eslint-plugin-chai-friendly");

module.exports = [
    pluginChaiFriendly.configs.recommendedV9, // note the V9 suffix
    // other configurations
]

This is a breaking change.

[ihordiachenko]

@brettz9 could you take a look?

[brettz9]

@brettz9 could you take a look?

Works for me (testing both flat format with ESLint 9 and regular and flat format with ESLint 8)

[brettz9]

However, sorry to think of this belatedly, but I think something like "recommendedFlat" would be a better config name since flat config has started in ESLint 8 and may continue beyond ESLint 9.

[ihordiachenko]

However, sorry to think of this belatedly, but I think something like "recommendedFlat" would be a better config name since flat config has started in ESLint 8 and may continue beyond ESLint 9.

Good point, renaming it to recommendedFlat