Release v0.8.0

Changelog

🔀 Merge

• Merge pull request #6 from redis-field-engineering/feat-stream-consumer-group, closes #6

🛠 Build

• Bump to next snapshot version

📝 Documentation

• Document ackBatchSize option

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• Releasing version 0.8.0
• Implement batch acknowledgments for better throughput
• Remove unused xrange-related code from ReadConfig
• Fix compilation errors after merge
• Merge upstream changes with consumer group implementation