v0.20.1

Fixed

• Fix CompletionDate field mapping in MeetingOperations to use CompleteTime instead of CloseTime (sync/async consistency)
• Fix Configuration.configure_api_key() documentation to use correct instance method pattern
• Add missing AuthenticationError documentation with usage examples
• Update dependencies list in documentation (add pydantic, typing-extensions)
• Fix code examples to use correct model field names (complete_date)
• Add bulk operations documentation for todos, issues, goals, and meetings
• Clarify default user ID behavior in user operations documentation
• Update method signatures and return types in API reference
• Fix async concurrency control documentation (max_concurrent parameter)
• Improve error handling examples throughout guides