Rearrage order of python versions. Hopefully travisci runs versions in my specified order. Run non-dev current versions first. Latest ResourceWarning failures only show up in 3.8 and 3.9, so let them run during the first batch of 4 jobs. Then backfill with earlier versions and nightly versions. Note travis has 3.9-dev even though it's tracking a released version.

def init_severity(db, cl, nodeid, newvalues):
    """Make sure severity is set on new issues"""
    if 'severity' in newvalues and newvalues['severity']:
        return

    normal = db.severity.lookup('normal')
    newvalues['severity'] = normal

def init(db):
    db.issue.audit('create', init_severity)