[GRASS-git] [OSGeo/grass] d950b4: CONTRIBUTING.md: improve commit message hint

[Markus Neteler]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: d950b4f450fc962abffc0aff87ff6868d6c1f7f6
      https://github.com/OSGeo/grass/commit/d950b4f450fc962abffc0aff87ff6868d6c1f7f6
  Author: Markus Neteler <neteler at gmail.com>
  Date:   2020-05-27 (Wed, 27 May 2020)

  Changed paths:
    M CONTRIBUTING.md

  Log Message:
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  CONTRIBUTING.md: improve commit message hint