message: remove exr error from public api
diff: @@ -346,7 +346,7 @@ impl From<Error> for ImageError {
  fn from(exr_error: Error) -> Self {
  ImageError::Decoding(DecodingError::new(
  ImageFormatHint::Exact(ImageFormat::Exr),
  - exr_error
  + exr_error.to_string()
  ))
  }
  }
  