feat(): add note about AOT being default since ng v9

[eduardoRoth]

Since v9 Angular made AOT the default compiler so, this doesn't apply if your app is running v9+

Instead of removing the file (which was my first approach) I added a note so if someone is using Angular 8 or previous version checks the list.

[d3lm]

Hey! Yes, I saw your first approach and I was about to comment if we wanted to add a note instead. Awesome that you changed it. That's some clairvoyance 😂

[d3lm]

🎉