Changelog updated

Author: remorhaz

CHANGELOG.md

@@ -4,6 +4,10 @@ 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]
+### Fixed
+- Issue #3: adding element to empty array fixed.
+
 ## [0.6.1] - 2019-11-18
 ### Fixed
 - All query exceptions have `getSource()` method now.