der: 0.7.10 changelog entry (#1768)

Author: baloo

der/CHANGELOG.md

@@ -4,6 +4,12 @@ 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).
 
+## 0.7.10 (2024-04-18)
+### Fixed
+- append in `Encode::encode_to_vec` (backport [#1760])
+
+[#1760]: https://github.com/RustCrypto/formats/pull/1760
+
 ## 0.7.9 (2024-04-01)
 ### Changed
 - make sure der is comptatible with potential language breaking changed (backport [#1374])