doc: changelog entry

Author: jvsena42

CHANGELOG.md

@@ -7,4 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- Fix ANR on RGS server settings screen caused by catastrophic regex backtracking #880
+
 [Unreleased]: https://github.com/synonymdev/bitkit-android/compare/v2.1.2...HEAD