Fixed bug in onResultSelect in app.js so new books will persist after page refresh

src/App.js

@@ -35,11 +35,11 @@ class BooksApp extends React.Component {
       this.setState({
         books: [...this.state.books, newBook]
       });
-    });
       const newBooks = this.state.books
       newBooks.forEach((book) => {
         update(book, book.shelf)
       })
+    });
     history.push('/');
   };