- Added create_pull_request, update_pull_request, merge_pull_request tools
- Added list_branches and delete_branch tools (fixed delete to handle 204 response)
- Enhanced add_comment to support inline comments on specific code lines
- Added all code review tools: approve/unapprove, request/remove changes, get diff
- Updated package version to 0.2.0
- Comprehensive documentation for all tools in README