function keepMetadata () {
  this.options.keepMetadata = 0b11111;
  return this;
}
Keep all metadata (EXIF, ICC, XMP, IPTC) from the input image in the output image.

The default behaviour, when `keepMetadata` is not used, is to convert to the device-independent
sRGB colour space and strip all metadata, including the removal of any ICC profile.

@since 0.33.0

@example
const outputWithMetadata = await sharp(inputWithMetadata)
  .keepMetadata()
  .toBuffer();

@returns {Sharp}