- add `stream_file()` to stream content from a URL into a file or a `BytesIO` object
- deprecated `save_file()`
- fixed `add_binary` when used without an fpath (69)
- deprecated `make_grayscale` option in image optimization
- Added support for in-memory optimization for PNG, JPEG, and WebP images
- allows enabling debug logs via ZIMSCRAPERLIB_DEBUG environ