chore: add CHANGELOG and modify version

Author: tanzaku

CHANGELOG

@@ -0,0 +1,14 @@
+# CHANGELOG
+
+## [0.2.0] - 2025-04-04
+
+### Improvements
+- Significant performance enhancement
+
+## [0.1.0] - 2025-03-21
+
+### Added
+- Initial release
+- PostgreSQL 17 syntax support
+- CST generation functionality following [gram.y](https://github.com/postgres/postgres/blob/REL_17_0/src/backend/parser/gram.y) structure
+- Pure Rust implementation enabling WebAssembly compilation via wasm-bindgen

crates/postgresql-cst-parser/CHANGELOG

@@ -0,0 +1,14 @@
+# CHANGELOG
+
+## [0.2.0] - 2025-04-04
+
+### Improvements
+- Significant performance enhancement
+
+## [0.1.0] - 2025-03-21
+
+### Added
+- Initial release
+- PostgreSQL 17 syntax support
+- CST generation functionality following [gram.y](https://github.com/postgres/postgres/blob/REL_17_0/src/backend/parser/gram.y) structure
+- Pure Rust implementation enabling WebAssembly compilation via wasm-bindgen

crates/postgresql-cst-parser/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "postgresql-cst-parser"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 repository = "https://github.com/tanzaku/postgresql-cst-parser"
 description = "An unofficial PostgreSQL CST parser written in Pure Rust."