do not use try-catch in the example

Author: mcollina

README.md

@@ -106,13 +106,10 @@ fastify.register(require('fastify-postgres'), {
 })
 
 fastify.post('/user/:username', (req, reply) => {
-  fastify.pg.transact(async client => {
-    try {
-      const id = await client.query('INSERT INTO users(username) VALUES($1) RETURNING id', [req.params.username])
-      reply.send(id)
-    } catch (err) {
-      reply.send(err)
-    }
+  // will return a promise
+  return fastify.pg.transact(async client => {
+    // will resolve to an id, or reject with an error
+    return await client.query('INSERT INTO users(username) VALUES($1) RETURNING id', [req.params.username])
   })
 })