Apply suggestions from code review

Co-authored-by: Sebastian Good <[email protected]>

README.md

@@ -20,9 +20,9 @@ npm install --save-dev eslint eslint-plugin-n
 
 | Version | Supported Node.js | Supported ESLint Version |
 |---------|-------------------|---------------------------|
-| 17.x   | `Node.js:^18.18.0 \|\| ^20.9.0 \|\| >=21.1.0`  | `ESLint>=8.23.0`          |
-| 16.x   | `Node.js>=16.0.0`   | `ESLint>=7.0.0`          |
-| 15.x   | `Node.js>=12.22.0`  | `ESLint>=7.0.0`          |
+| 17.x   | `^18.18.0 \|\| ^20.9.0 \|\| >=21.1.0`  | `>=8.23.0`          |
+| 16.x   | `>=16.0.0`   | `>=7.0.0`          |
+| 15.x   | `>=12.22.0`  | `>=7.0.0`          |
 
 **Note:** It recommends a use of [the "engines" field of package.json](https://docs.npmjs.com/files/package.json#engines). The "engines" field is used by `n/no-unsupported-features/*` rules.
 

tests/eslint-rule-tester.js

@@ -4,8 +4,8 @@
  */
 "use strict"
 const eslintVersion = require("eslint/package.json").version
-const RuleTester = require("eslint").RuleTester
-const unofficialApis = require("eslint/use-at-your-own-risk")
+const { RuleTester } = require("eslint")
+const { FlatRuleTester } = require("eslint/use-at-your-own-risk")
 const globals = require("globals")
 
 // greater than or equal to ESLint v9