Update README for release v3.9.0 (#1202)
Update README for release v3.9.0 (#1202)
mprobst/tslint,palantir/tslint,mprobst/tslint,andy-ms/tslint,andy-hanson/tslint,ScottSWu/tslint,mprobst/tslint,JoshuaKGoldberg/tslint,IllusionMH/tslint,JoshuaKGoldberg/tslint,RyanCavanaugh/tslint,nchen63/tslint,andy-hanson/tslint,ScottSWu/tslint,nchen63/tslint,YuichiNukiyama/tslint,bolatovumar/tslint,andy-hanson/tslint,berickson1/tslint,IllusionMH/tslint,andy-ms/tslint,ScottSWu/tslint,nchen63/tslint,berickson1/tslint,palantir/tslint,JoshuaKGoldberg/tslint,palantir/tslint,IllusionMH/tslint,bolatovumar/tslint,andy-ms/tslint,YuichiNukiyama/tslint,RyanCavanaugh/tslint,RyanCavanaugh/tslint,bolatovumar/tslint,berickson1/tslint,YuichiNukiyama/tslint