refactor the fetchPosts function in the postActions file

Author: vishalnagda1

src/actions/postActions.js

@@ -1,7 +1,6 @@
 import { FETCH_POSTS, NEW_POST } from "./types";
 
-export function fetchPosts() {
-  return function (dispatch) {
+export const fetchPosts = () => dispatch => {
     fetch("https://jsonplaceholder.typicode.com/posts")
       .then((res) => res.json())
       .then((posts) =>