Fix __version__ attribute

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Update project metadata and bump version to 0.2.1 for better clarity and user support.

📊 Key Changes

• Updated pyproject.toml to include more specific project URLs for bug reports and funding, and refined source link.
• Simplified the version specification in pyproject.toml.
• Updated the library version in __init__.py from 0.2.0 to 0.2.1.

🎯 Purpose & Impact

• Improved Support: Users now have direct links for reporting bugs and supporting the project financially. 🐞💖
• Simplified Project Metadata: Making it easier for tools and contributors to process project information. 🛠️
• Version Update: Reflects recent changes and improvements. This minor version increment indicates backward-compatible enhancements. 🆕

These updates aim to make the library more user-friendly and maintainable, enhancing the overall user and developer experience.