[GRASS-git] [OSGeo/grass-website] dc2001: Update credits.md

[Nicolas Bozon]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass-website
  Commit: dc20015917656e9bdc035a7fcce576900dbc19d9
      https://github.com/OSGeo/grass-website/commit/dc20015917656e9bdc035a7fcce576900dbc19d9
  Author: nbozon <nicolas.bozon at cartogenic.com>
  Date:   2019-12-30 (Mon, 30 Dec 2019)

  Changed paths:
    M content/about/credits.md

  Log Message:
  -----------
  Update credits.md

Add missing link to credits page