Update CHANGELOG for version 0.3.0

Updated changelog to reflect version 0.3.0 changes including breaking changes regarding Python version support.

Author: dishaprakash

CHANGELOG.md

@@ -1,15 +1,12 @@
 # Changelog
 
-## [1.0.0](https://github.com/googleapis/llama-index-cloud-sql-pg-python/compare/v0.2.3...v1.0.0) (2026-01-13)
+## [0.3.0](https://github.com/googleapis/llama-index-cloud-sql-pg-python/compare/v0.2.3...v0.3.0) (2026-01-13)
 
 
 ### ⚠ BREAKING CHANGES
 
 * Disable support for py3.9 and enable support for py3.13 ([#169](https://github.com/googleapis/llama-index-cloud-sql-pg-python/issues/169))
 
-### Miscellaneous Chores
-
-* Disable support for py3.9 and enable support for py3.13 ([#169](https://github.com/googleapis/llama-index-cloud-sql-pg-python/issues/169)) ([ca94007](https://github.com/googleapis/llama-index-cloud-sql-pg-python/commit/ca94007583597cf327740e2f3a8f79885a24760a))
 
 ## [0.2.3](https://github.com/googleapis/llama-index-cloud-sql-pg-python/compare/v0.2.2...v0.2.3) (2025-06-18)