Add change log README entry

README.md

@@ -9,6 +9,10 @@ The cooperative cloud utility belt 🎩🐇
 
 `abra` is a command-line tool for managing your own [Co-op Cloud](https://cloud.autonomic.zone). It can provision new servers, create applications, deploy them, run backup and restore operations and a whole lot of other things. It is the go-to tool for day-to-day operations when managing a Co-op Cloud instance.
 
+## Change log
+
+See [CHANGELOG.md](./CHANGELOG.md).
+
 ## Documentation
 
 > [docs.cloud.autonomic.zone](https://docs.cloud.autonomic.zone/)