shuffle the shards before recoding

examples/inbreeding.rs

@@ -203,6 +203,7 @@ where
 
         // recode a new random shard
         let coeffs: Vec<F> = (0..nb_shards_to_recode).map(|_| F::rand(rng)).collect();
+        shards.shuffle(rng);
         let s: Vec<_> = shards.iter().take(nb_shards_to_recode).cloned().collect();
         let new_shard = fec::recode_with_coeffs(&s, &coeffs).unwrap();
         shards.push(new_shard);