docs: note that this module is not needed with Nuxt 2.16+ (#42)

README.md

@@ -4,9 +4,13 @@
 [![npm downloads][npm-downloads-src]][npm-downloads-href]
 [![license][license-src]][license-href]
 
+## ⚠️ This package is no longer necessary with Nuxt >= 2.16 ⚠️
+
+PR [nuxt#9671](https://github.com/nuxt/nuxt/pull/9671) upgraded PostCSS to version 8.
+
 This module allows opting-in to [postcss@8](https://github.com/postcss/postcss/releases/tag/8.0.0) with nuxt 2 projects.
 
-- Ensures supported nuxt version is used (`>= 2.15.3`)
+- Ensures supported nuxt version is used (`>= 2.15.3 < 2.16.0`)
 - Forces to use correct dependencies using `__NUXT_PREPATHS__`
 - Will self-adjust integration method based on future nuxt versions
 - Use [`autoprefixer`](https://github.com/postcss/autoprefixer) instead of [`postcss-preset-env`](https://github.com/csstools/postcss-preset-env)