Update CHANGELOG for v0.2.0 release

Document the critical authentication polling fix that resolves the
AuthorizationPendingException issue where users would click "Allow"
in the browser but the CLI would fail instead of completing login.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: chaitan94

CHANGELOG.md

@@ -7,6 +7,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.2.0] - 2024-07-30
+
+### Fixed
+- **Critical**: Fixed SSO authentication polling to properly handle `AuthorizationPendingException`
+- Authentication flow now correctly waits for user to complete browser authorization instead of failing prematurely
+- Improved error handling with proper AWS SDK v2 typed errors instead of string matching
+- Added support for `SlowDownException` to respect server rate limiting
+- Added user-friendly polling status messages during authentication
+
+### Technical Improvements
+- Use `errors.As()` for robust error type checking
+- Handle both `AuthorizationPendingException` and `SlowDownException` properly
+- Maintain fallback string matching for compatibility
+- Enhanced authentication flow reliability
+
+This release fixes the main authentication issue where users would click "Allow" in the browser but the CLI would exit with an error instead of completing the login.
+
 ## [0.1.0] - 2024-07-30
 
 ### Added
@@ -47,5 +64,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Cobra CLI framework
 - Compatible with existing AWS SSO workflows
 
-[Unreleased]: https://github.com/adonmo/aws-sso-lib-go/compare/v0.1.0...HEAD
+[Unreleased]: https://github.com/adonmo/aws-sso-lib-go/compare/v0.2.0...HEAD
+[0.2.0]: https://github.com/adonmo/aws-sso-lib-go/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/adonmo/aws-sso-lib-go/releases/tag/v0.1.0