Mark parse_image() deprecated.

src/image.rs

@@ -41,6 +41,7 @@ use tiff::Field;
 ///
 /// The `buf` must be an empty `Vec<u8>` when this function is called.
 /// The raw Exif data is read into it.
+#[deprecated(since = "0.1.2", note = "use `exif::Reader` instead")]
 pub fn parse_image<'a, R>(mut reader: &mut R, mut buf: &'a mut Vec<u8>)
                           -> Result<(Vec<Field<'a>>, bool), Error>
     where R: io::BufRead

src/lib.rs

@@ -41,6 +41,7 @@
 //! ```
 
 pub use error::Error;
+#[allow(deprecated)]
 pub use image::parse_image;
 pub use jpeg::get_exif_attr as get_exif_attr_from_jpeg;
 pub use reader::Reader;