message: Correct documentation in README
diff: @@ -55,7 +55,7 @@ Ensure you have `node` and `yarn` installed on your system. Then run `yarn` in t
  To add a new rule, you need to take the following steps:
  -- Add the configuration and require to `src/index.js`.
  +- Add the configuration and require to `src/index.ts`.
  - Add the rule itself into `src/rules`.
  - Add the corresponding test in `src/rules/__tests__`.
  - Add the corresponding documentation in `docs/rules`.
  