in lib/prepare.js [184:189]
function checkIconsAttributes (icon) {
if (((icon.height && icon.width) >= 512 || (icon.height && icon.width) === undefined) && icon.src) return true;
events.emit('info', `The following${icon.target ? ` ${icon.target}` : ''} icon with a size of width=${icon.width} height=${icon.height} does not meet the requirements and will be ignored.`);
return false;
}