[GRASS-git] [OSGeo/grass-website] 062331: update year in grass citation

[Veronica Andreo]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass-website
  Commit: 0623319b91e79a552670c20d9504e9c02b43d979
      https://github.com/OSGeo/grass-website/commit/0623319b91e79a552670c20d9504e9c02b43d979
  Author: Veronica Andreo <veroandreo at gmail.com>
  Date:   2020-03-25 (Wed, 25 Mar 2020)

  Changed paths:
    M content/about/brand.md

  Log Message:
  -----------
  update year in grass citation