Mark ImageDataCompletionStatus as pub(crate)

Author: anforowicz

src/decoder/read_decoder.rs

@@ -173,7 +173,7 @@ impl<R: Read> ReadDecoder<R> {
 }
 
 #[derive(Debug, Eq, PartialEq)]
-pub enum ImageDataCompletionStatus {
+pub(crate) enum ImageDataCompletionStatus {
     ExpectingMoreData,
     Done,
 }