Update changelogs

Author: newpavlov

ascon-hash256/CHANGELOG.md

@@ -2,4 +2,9 @@
 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).
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 0.1.0 (UNRELEASED)
+- Initial release ([#841])
+
+[#841]: https://github.com/RustCrypto/hashes/pull/841

ascon-xof128/CHANGELOG.md

@@ -5,4 +5,6 @@ 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).
 
 ## 0.1.0 (UNRELEASED)
-- Initial release.
+- Initial release ([#841])
+
+[#841]: https://github.com/RustCrypto/hashes/pull/841