message: Fix link to contributors section in README
diff: <!-- prettier-ignore-start -->
  <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
  -[![All Contributors](https://img.shields.io/badge/all_contributors-13-orange.svg?style=flat-square)](#contributors-)
  +[![All Contributors](https://img.shields.io/badge/all_contributors-13-orange.svg?style=flat-square)](#contributors)
  <!-- ALL-CONTRIBUTORS-BADGE:END -->
  <!-- prettier-ignore-end -->
  