Add a changelog entry for yabridgectl

CHANGELOG.md

@@ -6,6 +6,19 @@ 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]
+
+### Added
+
+- By somewhat popular demand, yabridge now comes with yabridgectl, a utility
+  that can automatically set up and manage yabridge for you. It also performs
+  some basic checks to ensure that everything has been set up correctly.
+  Yabridgectl can be downloaded separately from the GitHub releases page and its
+  use is completely optional, so you don't have to use it if you don't want to.
+  Check out the
+  [readme](https://github.com/robbert-vdh/yabridge/tree/feature/cli-tools/tools/yabridgectl/README.md)
+  for more information on how it works.
+
 ## [1.2.1] - 2020-06-20
 
 ### Changed