update release checklist about security fixes
@@ -264,6 +264,7 @@ Checklist:
- make sure all issues for this milestone are closed or moved to the
next milestone
+- check if there are any pending fixes for security issues
- find and fix any low hanging fruit left on the issue tracker
- check that Travis CI is happy
- update ``CHANGES.rst``, based on ``git log $PREVIOUS_RELEASE..``
TW