docs: add note on postcss 7 support

postcss 7 not supported on version 4.0 and above
FullHuman · Jan 17, 2021 · 2457159 · 2457159
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commit 2457159
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diff --git a/docs/plugins/postcss.md b/docs/plugins/postcss.md
@@ -24,6 +24,11 @@ meta:
 
 # PostCSS
 
+::: warning
+If you are using PostCSS 7, install @fullhuman/postcss-purgecss 3.0.0: `npm i -D @fullhuman/postcss-purgecss@3.0.0`.
+From version 4.0, it is compatible with PostCSS >=8 only.
+:::
+
 ## Installation
 
 ```