v4.0.0
- migrate from httpx to curl_cffi
- CURL: simplified downloads, use ThreadPoolExecutor instead of asyncio
- exceptions: simplified, use DuckDuckGoSearchException and VQDExtractionException
- github workflow: added windows and macos
- tests: removed delays between tests, activated tests for text(backend="lite")
- CLI: save_json() - set encoding="utf-8" (bugfix for windows)