fix: carousel type error warning

Author: tangjinzhou

components/carousel/index.jsx

@@ -65,7 +65,7 @@ export const CarouselProps = {
   variableWidth: PropTypes.bool,
   useCSS: PropTypes.bool,
   slickGoTo: PropTypes.number,
-  responsive: PropTypes.array.def(null),
+  responsive: PropTypes.array,
 };
 
 const Carousel = {

components/vc-slick/src/default-props.js

@@ -31,7 +31,7 @@ const defaultProps = {
   pauseOnFocus: PropTypes.bool.def(false),
   // hover是否暂停
   pauseOnHover: PropTypes.bool.def(true),
-  responsive: PropTypes.array.def(null),
+  responsive: PropTypes.array,
   rows: PropTypes.number.def(1),
   rtl: PropTypes.bool.def(false),
   slide: PropTypes.string.def('div'),