Update changelog

CHANGELOG.md

@@ -18,6 +18,9 @@ All notable changes to this project will be documented in this file. Changes not
 
 # [Unreleased]
 
+## Added
+- Add support for using `**` as a catch-all at the end of a route. ([#479](https://github.com/httpswift/swifter/pull/479)) by [@michaelenger](https://github.com/michaelenger)
+
 # [1.5.0]
 
 ## Added