fix(docs): mongodb@5 (#213)

* fix(docs): mongodb@5

looking into this merged PR, it seems like you are using mongodb v5.x.x already and callbacks are not working anymore.

* replace reply.send with return

Co-authored-by: Manuel Spigolon <behemoth89@gmail.com>

* replace reply.send with return

Co-authored-by: Manuel Spigolon <behemoth89@gmail.com>

* rm reply.send

---------

Co-authored-by: Manuel Spigolon <behemoth89@gmail.com>

README.md

@@ -8,7 +8,7 @@ Fastify MongoDB connection plugin; with this you can share the same MongoDB conn
 
 Under the hood the official [MongoDB](https://github.com/mongodb/node-mongodb-native) driver is used,
 the options that you pass to `register` will be passed to the Mongo client.
-The `mongodb` driver is v4.x.x.
+The `mongodb` driver is v5.x.x.
 
 If you do not provide the client by yourself (see below), the URL option is *required*.
 
@@ -32,19 +32,18 @@ fastify.register(require('@fastify/mongodb'), {
  url: 'mongodb://mongo/mydb'
 })
 
-fastify.get('/user/:id', function (req, reply) {
+fastify.get('/user/:id', async function (req, reply) {
  // Or this.mongo.client.db('mydb').collection('users')
  const users = this.mongo.db.collection('users')
 
  // if the id is an ObjectId format, you need to create a new ObjectId
  const id = this.mongo.ObjectId(req.params.id)
- users.findOne({ id }, (err, user) => {
- if (err) {
- reply.send(err)
- return
- }
- reply.send(user)
- })
+ try {
+ const user = await users.findOne({ id })
+ return user
+ } catch (err) {
+ return err
+ }
 })
 
 fastify.listen({ port: 3000 }, err => {