update imports for React 18

Change-Id: Ibc75ce532003a478b31d5d85d84c83a017262041
diff --git a/client/src/components/ConversationView.js b/client/src/components/ConversationView.js
index ba9b932..9d12665 100644
--- a/client/src/components/ConversationView.js
+++ b/client/src/components/ConversationView.js
@@ -1,4 +1,4 @@
-import React, { useCallback, useContext, useEffect, useState } from 'react';
+import { useCallback, useContext, useEffect, useState } from 'react'
 import MessageList from './MessageList';
 import SendMessageForm from './SendMessageForm';
 import Conversation from '../../../model/Conversation';