Add SSE feature to the changelog.

Author: jmalloc

CHANGELOG.md

@@ -9,6 +9,10 @@ The format is based on [Keep a Changelog], and this project adheres to
 [Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
 [Semantic Versioning]: https://semver.org/spec/v2.0.0.html
 
+## [Unreleased]
+
+- Add the `/.see` route
+
 ## [0.2.0] - 2021-06-03
 
 - Add support for logging HTTP headers to stdout (thanks [@arulrajnet])