Update README.md

Author: brynary

README.md

@@ -14,7 +14,10 @@ For testing with [Mocha](https://github.com/mochajs/mocha), please check the [`m
 - [Jest](https://jestjs.io/)
 - Run tests with `npm test`
 - An account on Qlty (free for open source)
-- `QLTY_COVERAGE_TOKEN` is set as a GitHub Actions [repository secret](https://docs.github.com/en/actions/security-guides/using-secrets-in-github-actions#creating-secrets-for-a-repository)
+
+> [!NOTE]
+>
+> This repository is using GitHub's OpenID Connect (OIDC) to authenticate the coverage upload with Qlty Cloud instead of storing a coverage token as a GitHub Actions secret.
 
 ## Set up