Mongoose use only createdAt timestamp : <p>I have the following message schema in mongoose:</p>

<pre><code>var messageSchema = mongoose.Schema({
  userID: { type: ObjectId, required: true, ref: 'User' },
  text:   { type: String, required: true }
},
{
  timestamps: true
});
</code></pre>

<p>Is there anyway to ignore the updatedAt timestamp? Messages won't be updated so updatedAt will be wasted space</p>
