Alpaca-py

What's Changed
* fix: Fix get_corporate_announcements() by hiohiohio in https://github.com/alpacahq/alpaca-py/pull/480


**Full Changelog**: https://github.com/alpacahq/alpaca-py/compare/v0.27.0...v0.27.1

Incompatibility change
- We enhanced Market Data Streaming. However, there could be incompatibility changes (assuming most of users may not be impacted)
- renamed to DataStream from BaseStream with changing file location of websocket.py
- previously BaseStream has subscribe/unsubscribe methods. But now each streaming client extended from DataStream has subscribe/unsubscribe methods.

What's Changed
* Real-time News Data Stream via WebSocket Subscription by IsaacTrevino in https://github.com/alpacahq/alpaca-py/pull/392
* Update the market data streams by gnvk in https://github.com/alpacahq/alpaca-py/pull/473
* doc: Update README.md to introduce stock/options historical data client by hiohiohio in https://github.com/alpacahq/alpaca-py/pull/479

New Contributors
* IsaacTrevino made their first contribution in https://github.com/alpacahq/alpaca-py/pull/392

**Full Changelog**: https://github.com/alpacahq/alpaca-py/compare/v0.26.1...v0.27.0

What's Changed
* fix: Change Visa_Type to match API expectations. by RayOconnor in https://github.com/alpacahq/alpaca-py/pull/478

New Contributors
* RayOconnor made their first contribution in https://github.com/alpacahq/alpaca-py/pull/478

**Full Changelog**: https://github.com/alpacahq/alpaca-py/compare/v0.26.0...v0.26.1

What's Changed
* feat: Add sandbox data support by DeXtreme in https://github.com/alpacahq/alpaca-py/pull/464

New Contributors
* DeXtreme made their first contribution in https://github.com/alpacahq/alpaca-py/pull/464

**Full Changelog**: https://github.com/alpacahq/alpaca-py/compare/v0.25.0...v0.26.0

What's Changed
* feat: Add asof parameter to historical stock data requests by gnvk in https://github.com/alpacahq/alpaca-py/pull/477
* fix: Remove model_config for sphinx by hiohiohio in https://github.com/alpacahq/alpaca-py/pull/474


**Full Changelog**: https://github.com/alpacahq/alpaca-py/compare/v0.24.0...v0.25.0

What's Changed
* feat: Add kyc_results into broker account by hiohiohio in https://github.com/alpacahq/alpaca-py/pull/467


**Full Changelog**: https://github.com/alpacahq/alpaca-py/compare/v0.23.0...v0.24.0