Real-time news over WebSocket

What's New

• Added real-time news streaming over WebSocket — register a query once and receive matching articles as they're published.
• Added websocket_fetch() and websocket_delete() for managing registrations.
• Added stream_async() for asyncio applications.
• Automatic reconnection with capped exponential backoff.

Breaking Changes

• Python 3.10+ is now required.
• websockets is now a required dependency.
• pip install newsdataapi installs all required dependencies.
• Python 3.8/3.9 users will continue receiving v0.2.3.