Update README.md

README.md

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 > As of Stylelint v15 [all style-related rules have been deprecated](https://stylelint.io/migration-guide/to-15#deprecated-stylistic-rules). If you are using v15 or higher and are not making use of these deprecated rules, [this plugin is no longer necessary](https://stylelint.io/migration-guide/to-15#:~:text=Additionally%2C%20you%20may%20no%20longer%20need%20to%20extend%20Prettier%27s%20Stylelint%20config).
 
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 It's common to [pair Stylelint with Prettier](https://prettier.io/docs/en/integrating-with-linters.html#stylelint). If you're going to use both, you'll want to add [`stylelint-config-prettier`](https://github.com/prettier/stylelint-config-prettier), which is a config that disables any Stylelint rules that conflict with Prettier.
 
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