add changelog

Author: mruoss

CHANGELOG.md

@@ -5,14 +5,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+- Use Kubereq.attach/2 in place of deprecated Kubereq.new/2 [#37](https://github.com/mruoss/kubegen/issues/37), [#38](https://github.com/mruoss/kubegen/pull/38)
+
 ## 0.1.1
 
 ### Fixed
 
 - License was wrong in `mix.exs`
 
-## Unreleased
-
 <!-- Add your changelog entry to the relevant subsection -->
 
 <!-- ### Added | Changed | Deprecated | Removed | Fixed | Security -->