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## CDN updates

* Previously, when `-/format/` was not specified, we attempted to preserve the
  original image format (e.g., providing PNG if the original was PNG). Now, we
  choose a format based on the content. If the image appears to be an
  illustration, PNG will be used. Please note that you still need to explicitly
  specify `-/format/auto/` for AVIF and WebP output.
* New option `-/format/preserve/` is added.

[https://uploadcare.com/docs/compression/#operation-format](https://uploadcare.com/docs/compression/#operation-format)