chore(changelog): update CHANGELOG.md

Author: ns-vasilev

CHANGELOG.md

@@ -8,6 +8,10 @@ All notable changes to this project will be documented in this file.
 
 - Update README.md (#32)
 
+### 🧪 Testing
+
+- Implement unit tests (#33)
+
 ### ⚙️ Miscellaneous Tasks
 
 - Switch from Makefile to Mise (#17)
@@ -21,6 +25,7 @@ All notable changes to this project will be documented in this file.
 - *(ci)* Add release workflow for GitHub Actions (#23)
 - Add renovate configuration (#30)
 - *(changelog)* Update CHANGELOG.md
+- *(changelog)* Update CHANGELOG.md
 
 ## [0.0.1] - 2023-06-18