Update CHANGELOG

Author: mjackson

packages/headers/CHANGELOG.md

@@ -2,6 +2,11 @@
 
 This is the changelog for [`headers`](https://github.com/mjackson/remix-the-web/tree/main/packages/headers). It follows [semantic versioning](https://semver.org/).
 
+## HEAD
+
+- Use one set of types for all built files, instead of separate types for ESM and CJS
+- Build using esbuild directly instead of tsup
+
 ## v0.10.0 (2025-01-27)
 
 This release contains several improvements to `Cookie` that bring it more in line with other headers like `Accept`, `AcceptEncoding`, and `AcceptLanguage`.