refactor the code

Author: vishalnagda1

src/components/Posts.js

@@ -8,7 +8,7 @@ class Posts extends Component {
     this.props.fetchPosts();
   }
 
-  componentWillReceiveProps(nextProps) {
+  UNSAFE_componentWillReceiveProps(nextProps) {
     if (nextProps.newPost) {
       this.props.posts.unshift(nextProps.newPost);
     }

src/reducers/postReducer.js

@@ -1,5 +1,4 @@
 import { FETCH_POSTS, NEW_POST } from "../actions/types";
-import { act } from "react-dom/test-utils";
 
 const initialState = {
   items: [],