feat: remove ReactDom findDomNode

Author: CoderSerio

README.md

@@ -24,7 +24,7 @@ https://virtual-list-react-component.vercel.app/
 ```bash
 npm install
 npm start
-open http://localhost:9001/
+open http://localhost:8000/
 ```
 
 ## Feature

examples/basic.tsx

@@ -202,7 +202,7 @@ const Demo = () => {
         <button
           type="button"
           onClick={() => {
-            listRef.current.scrollTo({
+            listRef.current?.scrollTo({
               index: 50,
               align: 'top',
             });