Merge pull request #113 from Eirik0/edition-2018-clean-up

Edition 2018 clean up

zcash_proofs/src/circuit/pedersen_hash.rs

@@ -159,7 +159,7 @@ mod test {
 
         for length in 0..751 {
             for _ in 0..5 {
-                let mut input: Vec<bool> = (0..length).map(|_| rng.next_u32() % 2 != 0).collect();
+                let input: Vec<bool> = (0..length).map(|_| rng.next_u32() % 2 != 0).collect();
 
                 let mut cs = TestConstraintSystem::<Bls12>::new();