Added Visual Studio to readme's support list
Added Visual Studio to readme's support list

Alphabetized the list of supported editors too...

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