docs: changed configs to flatConfigs

Author: NishargShah

README.md

@@ -37,7 +37,7 @@ import reactRefresh from "eslint-plugin-react-refresh";
 
 export default [
   /* Main config */
-  reactRefresh.configs.recommended,
+  reactRefresh.flatConfigs.recommended,
 ];
 ```
 
@@ -50,7 +50,7 @@ import reactRefresh from "eslint-plugin-react-refresh";
 
 export default [
   /* Main config */
-  reactRefresh.configs.vite,
+  reactRefresh.flatConfigs.vite,
 ];
 ```