CodeIgniter 4.0.0-beta.3 released

I think the quoted text from the docs means upgrading from version 3 to version 4. I was asking about upgrading from CodeIgniter 4.0.0-beta.3 to CodeIgniter 4.0.0....but never mind...I've got so much work right now, by the time I'll be free CI 4.0 will probably be released (fingers crossed )

You can see things I made with codeigniter here: itart.pro its not overly impressive as I have very little time to learn.