Fix a minor markdown formatting issue in readme
Fix a minor markdown formatting issue in readme

berickson1/tslint,andy-ms/tslint,Pajn/tslint,mprobst/tslint,Pajn/tslint,berickson1/tslint,mprobst/tslint,JoshuaKGoldberg/tslint,YuichiNukiyama/tslint,weswigham/tslint,palantir/tslint,RyanCavanaugh/tslint,andy-ms/tslint,bolatovumar/tslint,ScottSWu/tslint,nchen63/tslint,ScottSWu/tslint,andy-hanson/tslint,YuichiNukiyama/tslint,YuichiNukiyama/tslint,palantir/tslint,RyanCavanaugh/tslint,bolatovumar/tslint,ScottSWu/tslint,palantir/tslint,weswigham/tslint,berickson1/tslint,mprobst/tslint,weswigham/tslint,andy-hanson/tslint,Pajn/tslint,andy-hanson/tslint,andy-ms/tslint,nchen63/tslint,IllusionMH/tslint,IllusionMH/tslint,bolatovumar/tslint,JoshuaKGoldberg/tslint,nchen63/tslint,IllusionMH/tslint,JoshuaKGoldberg/tslint,RyanCavanaugh/tslint