Fix Clippy (#85)

src/tests/test_cfrg_vectors.rs

@@ -60,15 +60,15 @@ fn populate_test_vectors(values: &JsonValue) -> VOPRFTestVectorParameters {
 fn decode(values: &JsonValue, key: &str) -> Vec<u8> {
     values[key]
         .as_str()
-        .and_then(|s| hex::decode(&s).ok())
+        .and_then(|s| hex::decode(s).ok())
         .unwrap_or_default()
 }
 
 fn decode_vec(values: &JsonValue, key: &str) -> Vec<Vec<u8>> {
     let s = values[key].as_str().unwrap();
     let res = match s.contains(',') {
-        true => Some(s.split(',').map(|x| hex::decode(&x).unwrap()).collect()),
-        false => Some(vec![hex::decode(&s).unwrap()]),
+        true => Some(s.split(',').map(|x| hex::decode(x).unwrap()).collect()),
+        false => Some(vec![hex::decode(s).unwrap()]),
     };
     res.unwrap()
 }