update README to reflect new assets path
update README to reflect new assets path

cerealcommas/mashgraphics,eads/dailygraphics,louisstow/dailygraphics,swastvedt/dailygraphics,BenHeubl/dailygraphics,nprapps/dailygraphics,wjcjenny/dailygraphics,louisstow/dailygraphics,cerealcommas/mashgraphics,eads/dailygraphics,stlpublicradio/dailygraphics,BenHeubl/dailygraphics,tophtucker/dailygraphics,louisstow/dailygraphics,abcnews/dailygraphics,stlpublicradio/dailygraphics,tophtucker/dailygraphics,eads/dailygraphics,onyxfish/dailygraphics,abcnews/dailygraphics,nprapps/dailygraphics,nprapps/dailygraphics,swastvedt/dailygraphics,BenHeubl/dailygraphics,stlpublicradio/dailygraphics,abcnews/dailygraphics,wjcjenny/dailygraphics,onyxfish/dailygraphics,cerealcommas/mashgraphics,nprapps/dailygraphics,swastvedt/dailygraphics,wjcjenny/dailygraphics,abcnews/dailygraphics,stlpublicradio/dailygraphics,onyxfish/dailygraphics