removes default implementation of info

src/descriptors/dct.rs

@@ -103,6 +103,9 @@ impl DCT {
 }
 
 impl Descriptor for DCT {
+    fn info(&self) -> String {
+        "DCT".to_string()
+    }
     fn describe(&self, img: &image::DynamicImage) -> u64 {
         let resized = self.resize(img);
         let mut dct_values = self.dct(&resized);