resolve #50 and #47 (missing attr)

Author: sagiv.bengiat

src/react-elastic-carousel/components/styled/StyledCarousel.js

@@ -1,8 +1,11 @@
 import styled from "styled-components";
 
-export default styled.div`
+export default styled.div.attrs(props => ({
+  style: {
+    height: props.size.height
+  }
+}))`
   display: flex;
   flex-direction: row;
   width: 100%;
-  height: ${({ size }) => `${size.height}px`};
 `;