Update README.md

There was no loading var initialized, but it was used in the loadNextPage.

Author: Evanc123

README.md

@@ -31,6 +31,8 @@ import useInfiniteScroll from 'react-infinite-scroll-hook';
 function InfiniteList({}) {
  const [items, setItems] = useState([]);
  const [hasNextPage, setHasNextPage] = useState();
+ const [loading, setLoading] = useState(false);
+
 
  /// ...