Remove dead plugins

Author: ai

README.md

@@ -6,15 +6,13 @@
 
 [PostCSS] for for CSS-in-JS and styles in JS objects.
 
-For example, to use [Stylelint], [RTLCSS] or [postcss-write-svg] plugins
-in your workflow.
+For example, to use [Stylelint] or [RTLCSS] plugins in your workflow.
 
 <a href="https://evilmartians.com/?utm_source=postcss-js">
   <img src="https://evilmartians.com/badges/sponsored-by-evil-martians.svg"
        alt="Sponsored by Evil Martians" width="236" height="54">
 </a>
 
-[postcss-write-svg]: https://github.com/jonathantneal/postcss-write-svg
 [Stylelint]:         https://github.com/stylelint/stylelint
 [PostCSS]:           https://github.com/postcss/postcss
 [RTLCSS]:            https://github.com/MohammadYounes/rtlcss