Update async syntax in ring example
Update async syntax in ring example

olleolleolle/celluloid,TiagoCardoso1983/celluloid,dilumn/celluloid,marshall-lee/celluloid,jstoja/celluloid,sideci-sample/sideci-sample-celluloid,tarcieri/celluloid,kenichi/celluloid,davydovanton/celluloid,mehta/celluloid,seuros/celluloid,jasonm23/celluloid,celluloid/celluloid