Update README.md

[miwashutaro0611]

README.md information is out of date and needs to be updated

Planned Changes

1. Deletion of the phrase "IE support"

In v13, :where is used, and :where is not IE-compatible, so the phrase "IE-compatible" should be removed.

refer: https://caniuse.com/?search=where

2. Update on Area Features

The information in part Features is out of date and needs to be updated.
Since I don't know what the overall changes are, I will try to fix the selectors of existing rules and those that have already been removed.

e.g.

html { → :where(:root)

a, area, button, input, label, select, summary, textarea, [tabindex] {
  -ms-touch-action: manipulation;
  touch-action: manipulation;
}

↓

delete