chore: Update README.md (#553)

README.md

@@ -42,7 +42,7 @@ Retrieve all changed files and directories relative to the target branch (`pull_
 > NOTE: :warning:
 >
 > *   **IMPORTANT:** For `push` events you need to include `fetch-depth: 0` **OR** `fetch-depth: 2` depending on your use case.
-> *   When using `persist-credentials: false` with `actions/checkout@v2` you'll need to specify a `token` using the `token` input.
+> *   When using `persist-credentials: false` with `actions/checkout@v3` you'll need to specify a `token` using the `token` input.
 > *   For monorepos where pulling all the branch history might not be desired, you can omit `fetch-depth` for `pull_request` events.
 > *   For files located in a sub-directory ensure that the pattern specified contains `**/` (globstar) to match any preceding directories or explicitly pass the full path relative to the project root. See: [#314](https://github.com/tj-actions/changed-files/issues/314).