message: Rephrase minimum requirement for linting conditions
diff: The minimum requirements for code contributions are:
  -1. The code _must_ be compliant with the
  - [JS Standard Code Style rules](http://standardjs.com) or their
  - correspondingly configured ESLint rules.
  +1. The code _must_ be compliant with the configured ESLint rules based
  + on the [JS Standard Code Style](http://standardjs.com).
  2. All new and changed code _should_ have a corresponding unit and/or
  integration test.
  3. New and changed challenges _must_ have a corresponding e2e test.
  4. Linting, as well as all unit, integration and e2e tests _should_ pass
  locally before opening a Pull Request.
  -5. All Git commits within a PR must be
  +5. All Git commits within a PR _must_ be
  [signed off](https://git-scm.com/docs/git-commit#Documentation/git-commit.txt--s)
  to indicate the contributor's agreement with the
  [Developer Certificate of Origin](https://developercertificate.org/).
  