docs(readme): replace fastify.io links with fastify.dev (#195)

Signed-off-by: Frazer Smith <frazer.dev@outlook.com>

README.md

@@ -68,7 +68,7 @@ async function subsystem (fastify, opts) {
 ### Hooks and middleware
 
 __Every registered middleware will be run during the `onRequest` hook phase__, so the registration order is important.
-Take a look at the [Lifecycle](https://www.fastify.io/docs/latest/Reference/Lifecycle/) documentation page to understand better how every request is executed.
+Take a look at the [Lifecycle](https://www.fastify.dev/docs/latest/Reference/Lifecycle/) documentation page to understand better how every request is executed.
 
 ```js
 const fastify = require('fastify')()
@@ -106,7 +106,7 @@ It is possible to change the Fastify hook that the middleware will be attached t
 
 To change the hook, pass a `hook` option like so:
 
-*Note you can access `req.body` from the `preParsing`, `onError`, `preSerialization` and `onSend` lifecycle steps. Take a look at the [Lifecycle](https://www.fastify.io/docs/latest/Reference/Lifecycle/) documentation page to see the order of the steps.*
+*Note you can access `req.body` from the `preParsing`, `onError`, `preSerialization` and `onSend` lifecycle steps. Take a look at the [Lifecycle](https://www.fastify.dev/docs/latest/Reference/Lifecycle/) documentation page to see the order of the steps.*
 
 ```js
 const fastify = require('fastify')()