docs(README): remove list optimisation text

[varjmes]

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Lists have been optimised via choojs/nanomorph#8 in v5.0.0
I've removed the text.

It may be that you still want to explain list reordering optimisations using nanomorph. If so, you can mash that close button and write up an explanation 📝

Ty for choo! 🚂

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[yoshuawuyts]

Haha, hey! Happy to see you here! 😁 - umm, so the thing is that nanomorph v5 is currently a lil broken (oops); work is being done in choojs/nanomorph#71 to fix it. That's why it's not part of any of the choo releases yet, and why that notice was still there haha.

That patch is one of two holding up the choo v6 release (see #489 for progress); the other patch is redoing choojs/nanohtml#77 to fix whitespace issues in the v4 line (also not shipped into choo yet).

Hope this makes sense haha ✨ - you're right in that we should write an explanation on how child reordering works tho; on the choo 6 branch I don't think we have written that yet. If you're keen a PR would be rad.

Anyway, yay thanks for the PR!

[varjmes]

I would have no idea what to write! So I will not be able to 😂

Thanks yosh~