title: MongoParseError: options useCreateIndex, useFindAndModify are not supported
body: <p>I tried to run it and it said an error like the title. and
  this is my code:</p>
  <pre><code>const URI = process.env.MONGODB_URL;
  
  mongoose.connect(URI, {
     useCreateIndex: true, 
     useFindAndModify: false, 
     useNewUrlParser: true, 
     useUnifiedTopology: true 
  }, err =&gt; {
     if(err) throw err;
     console.log('Connected to MongoDB!!!')
  })
  </code></pre>
  <p>I set the MONGODB_URL in .env :</p>
  <pre><code>MONGODB_URL = mongodb+srv://username:&lt;password&gt;@cluster0.accdl.mongodb.net/website?retryWrites=true&amp;w=majority
  </code></pre>
  <p>How to fix it?</p>