howto_release.md: add close of GH milestone

OSGeo · Dec 22, 2020 · e577dc8 · e577dc8
1 parent 790d70f
commit e577dc8
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diff --git a/doc/howto_release.md b/doc/howto_release.md
@@ -255,6 +255,10 @@ vim grass-addons/tools/addons/grass-addons-build.sh
 vim grass-addons/tools/addons/grass-addons.sh
 ```
 
+### Close milestone
+
+- Close related milestone: https://github.com/OSGeo/grass/milestones
+
 Release is done.
 
 ### Advertise the new release