README improvements [ci skip]
README improvements [ci skip]

kaktus40/js-xlsx,iCasa/js-xlsx,kaktus40/js-xlsx,thien-thach/searchFromExcel,kaktus40/js-xlsx,kaktus40/js-xlsx,iCasa/js-xlsx,SheetJS/js-xlsx,thien-thach/searchFromExcel,SheetJS/js-xlsx,SheetJS/js-xlsx,SheetJS/js-xlsx,iCasa/js-xlsx,iCasa/js-xlsx