Update changelog

Author: adamwathan

CHANGELOG.md

@@ -15,6 +15,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - JIT: Explicitly error when `-` is used as a custom separator ([#4704](https://github.com/tailwindlabs/tailwindcss/pull/4704))
 - JIT: Don't add multiple `~` when stacking `peer-*` variants ([#4757](https://github.com/tailwindlabs/tailwindcss/pull/4757))
+- Remove outdated focus style fix in Preflight ([#4780](https://github.com/tailwindlabs/tailwindcss/pull/4780))
+- Enable `purge` if provided on the CLI ([#4772](https://github.com/tailwindlabs/tailwindcss/pull/4772))
+- JIT: Fix error when not using a config file with postcss-cli ([#4773](https://github.com/tailwindlabs/tailwindcss/pull/4773))
+- Fix issue with `resolveConfig` not being importable in Next.js pags ([#4725](https://github.com/tailwindlabs/tailwindcss/pull/4725))
 
 ## [2.2.2] - 2021-06-18