Add new monitoring options for release-monitoring
    
    This is a followup for https://pagure.io/pagure/pull-request/5294
    
    These new options are already supported and documented in the-new-hotness and
    will be available in next release.
    
    Link to documentation:
    https://the-new-hotness.readthedocs.io/en/latest/user-guide.html#notifications-settings
    
    Signed-off-by: Michal Konečný <mkonecny@redhat.com>