[GRASS-git] [OSGeo/grass] 084cdb: howto_release.md: add close of GH milestone

[Markus Neteler]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: 084cdb27d5960a25c083b7d24e1523af2b67e263
      https://github.com/OSGeo/grass/commit/084cdb27d5960a25c083b7d24e1523af2b67e263
  Author: Markus Neteler <neteler at gmail.com>
  Date:   2020-12-22 (Tue, 22 Dec 2020)

  Changed paths:
    M doc/howto_release.md

  Log Message:
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  howto_release.md: add close of GH milestone