Migration adjustment
Migration adjustment (#106) * Bump celery from 4.2.1 to 5.2.2 in test requirements * Adjust a migration to refer to jsonfield using correct v3.1+ nomenclature
Migration adjustment (#106) * Bump celery from 4.2.1 to 5.2.2 in test requirements * Adjust a migration to refer to jsonfield using correct v3.1+ nomenclature