chore: Update changelog for version 0.2.0 with recent enhancements and bug fixes. (#17)

Author: terabytesoftw

CHANGELOG.md

@@ -1,6 +1,12 @@
 # Change Log
 
-## 0.1.1 Under development
+## 0.2.0 Under development
+
+- Enh #12: Upgrade to `PHPStan` `2.1` (@glpzzz)
+- Enh #13: Enhance `PHPStan` integration with yii2 extensions.
+- Enh #14: Consolidate `PHPUnit` workflows and update `README.md` with `Yii2` version badges.
+- Bug #15: Correct badge label formatting for `Yii2` version in `README.md`.
+- Bug #16: Remove duplicate concurrency settings from phpunit-compatibility job in `build.yml`.
 
 ## 0.1.0 February 27, 2024