changelog: Add `default` as option to `severity`
changelog: Add `default` as option to `severity`
IllusionMH/tslint,andy-hanson/tslint,palantir/tslint,IllusionMH/tslint,JoshuaKGoldberg/tslint,andy-hanson/tslint,andy-hanson/tslint,andy-ms/tslint,IllusionMH/tslint,mprobst/tslint,berickson1/tslint,palantir/tslint,JoshuaKGoldberg/tslint,berickson1/tslint,andy-ms/tslint,RyanCavanaugh/tslint,RyanCavanaugh/tslint,palantir/tslint,mprobst/tslint,andy-ms/tslint,RyanCavanaugh/tslint,mprobst/tslint,berickson1/tslint,JoshuaKGoldberg/tslint