Updated the old recommended installation approach for django with the…

… latest link

readme.md

@@ -121,7 +121,7 @@ docker compose logs -f
 
 ## Setup with Virtualenv
 
-You can run the Wagtail demo locally without setting up Vagrant or Docker and simply use Virtualenv, which is the [recommended installation approach](https://docs.djangoproject.com/en/3.2/topics/install/#install-the-django-code) for Django itself.
+You can run the Wagtail demo locally without setting up Vagrant or Docker and simply use Virtualenv, which is the [recommended installation approach](https://docs.djangoproject.com/en/5.1/topics/install/#install-the-django-code) for Django itself.
 
 #### Dependencies