docs: update readme

Author: int64ago

README.md

@@ -49,7 +49,7 @@ yarn add @use-hooks/interval
 ```js
 import React, { useState } from 'react';
 
-import useInterval from '@use-hooks/interval/index';
+import useInterval from '@use-hooks/interval';
 
 export default function App() {
   const [count, setCount] = useState(0);

example/App.jsx

@@ -1,6 +1,6 @@
 import React, { useState } from 'react';
 
-import useInterval from '../src/index';
+import useInterval from '../src';
 
 export default function App() {
   const [count, setCount] = useState(0);