update gitignore
update gitignore

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