Fixed #1693 Same URLs didn't cancel download
Fixed #1693 Same URLs didn't cancel download

dreampiggy/SDWebImage,geoffmacd/SDWebImage,ruaho/SDWebImage,Kekanto/SDWebImage,cochat/SDWebImage,rs/SDWebImage,dreampiggy/SDWebImage,iheartradio/SDWebImage,buleSky111/SDWebImage,dpettigrew/SDWebImage,klundberg/SDWebImage,smule/SDWebImage,zhang-yawei/SDWebImage,tualatrix/SDWebImage,awkward/SDWebImage,altrooz/SDWebImage,awkward/SDWebImage,Insfgg99x/SDWebImage,awkward/SDWebImage,dreampiggy/SDWebImage,iosnatarajan/SDWebImage,amyhametov/SDWebImage,Frntbac/SDWebImage,odyth/SDWebImage