[tagpr] update CHANGELOG.md

Author: github-actions[bot]

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## [v2.0.0](https://github.com/k1LoW/oldstable/compare/v1.1.1...v2.0.0) - 2025-10-26
+### Breaking Changes 🛠
+- fix: enhance lax mode to support oldstable and older versions by @k1LoW in https://github.com/k1LoW/oldstable/pull/15
+- fix: improve handling of go directive version checks by @k1LoW in https://github.com/k1LoW/oldstable/pull/16
+### Other Changes
+- chore: add test for --lax by @k1LoW in https://github.com/k1LoW/oldstable/pull/13
+- chore: setup tagpr labels by @k1LoW in https://github.com/k1LoW/oldstable/pull/12
+
 ## [v1.1.1](https://github.com/k1LoW/oldstable/compare/v1.1.0...v1.1.1) - 2024-11-04
 ### Fix bug 🐛
 - Set lax by @k1LoW in https://github.com/k1LoW/oldstable/pull/11