Update changelog

CHANGELOG.md

@@ -5,6 +5,13 @@ 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
+
+### Changed
+
+- Locked the symbol input in the edit transaction dialog
+- Filtered the account selector by account type (`SECURITIES`) in the create or edit transaction dialog
+
 ## 1.78.0 - 20.11.2021
 
 ### Added