docs: update changelog

FullHuman · Jan 17, 2021 · 07e4e6d · 07e4e6d
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+# [](https://github.com/FullHuman/purgecss/compare/v4.0.0...v) (2021-01-17)
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+### Breaking Changes
+Drop PostCSS 7 support, use @fullhuman/postcss-purgecss 3.0 with PostCSS 7.
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 # [](https://github.com/FullHuman/purgecss/compare/v3.1.3-alpha.0...v) (2020-12-15)
 
 * **postcss-purgecss** remove postcss 8 as peer dependency