Update changelog with a note about the speed improvements of the pool
Update changelog with a note about the speed improvements of the pool

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