v0.2.0: LangChain engine, custom prompt signature descriptions

✨ New features and improvements

• Add LangChain engine (#47)
• Add custom prompt signature description (#48)
• Better dependency management via optional requirement blocks (#41)

🔴 Bug fixes

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⚠️ Backwards incompatibilities

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📖 Documentation and examples

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👥 Contributors

@rmitsch

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Full Changelog: v0.1...v0.2