Remove needless singleton on YahooProvider
Remove needless singleton on YahooProvider

PhilAndrew/play-silhouette-slick3-postgres-seed,Empia/corpreg,n0tel/play-silhouette-seed,mohiva/play-silhouette-seed,leoromanovsky/play-silhouette-slick-seed,leoromanovsky/play-silhouette-slick-seed,raisercostin/play-silhouette-slick-seed,CapeSepias/play-silhouette-slick-seed,PhilAndrew/play-silhouette-slick3-postgres-seed,eaceaser/play-silhouette-slick-seed,akkie/play-silhouette-seed,n0tel/play-silhouette-seed,eaceaser/play-silhouette-slick-seed,sbrunk/play-silhouette-slick-seed,Empia/corpreg,Empia/corpreg,CapeSepias/play-silhouette-slick-seed,glidester/play-silhouette-seed,Empia/corpreg,mohiva/play-silhouette-seed,sbrunk/play-silhouette-slick-seed,raisercostin/play-silhouette-slick-seed,raisercostin/play-silhouette-slick-seed,Empia/corpreg,joaoraf/dwws-test1,joaoraf/dwws-test1,akkie/play-silhouette-seed,akkie/play-silhouette-seed,glidester/play-silhouette-seed,mohiva/play-silhouette-seed,PhilAndrew/play-silhouette-slick3-postgres-seed