chore: update changelog

packages/vite/CHANGELOG.md

@@ -1,5 +1,26 @@
 # [2.4.0-beta.0](https://github.com/vitejs/vite/compare/v2.3.8...v2.4.0-beta.0) (2021-06-27)
 
+### BREAKING CHANGES
+
+- **server:** `server.fsServe` renamed to `server.fs` ([#3965](https://github.com/vitejs/vite/pull/3965))
+- **server:** `server.fs.root` deprecated in favor of `server.fs.allow` ([#3968](https://github.com/vitejs/vite/pull/3968))
+
+### Security
+
+We have improved the file serving boundaries detection with ([#3784](https://github.com/vitejs/vite/issues/3784)). While it's still experimental and **disabled by default**, you can opt-in it by
+
+```js
+// vite.config.js
+export default {
+  server: {
+    fs: {
+      strict: true
+    }
+  }
+}
+```
+
+It should smartly serve the files related to your project (directly imported, linked deps, etc.) while denying the rest. If you find any false-negative, please [open an issue](https://github.com/vitejs/vite/issues/new?assignees=&labels=pending+triage&template=bug_report.yml) with reproduction to report.
 
 ### Bug Fixes