Update README.txt, use .cjs extension for config file

README.md

@@ -9,7 +9,7 @@ Then install this package as a development dependency `npm i -D @leukeleu/eslint
 ## Adding the config
 
 In the configs folder you can find all the Eslint config files to choose from.
-Select the config you need and add it to your `.eslintrc.js`:
+Select the config you need and add it to your `.eslintrc.cjs`:
 
 ```js
 module.exports = {