do-release.sh: add note about milestones

Author: adangel

do-release.sh

@@ -159,6 +159,12 @@ echo "Verify, news entry has been created: https://sourceforge.net/p/pmd/news/"
 echo
 echo Update the marketplace entry with the new version:
 echo https://marketplace.eclipse.org/content/pmd-eclipse-plugin/edit
+echo
+echo "Check the milestone on github:"
+echo "<https://github.com/pmd/pmd-eclipse-plugin/milestones>"
+echo " --> move any open issues to the next milestone, close the current milestone"
+echo
+
 echo
 
 echo