Merge pull request #626 from zcash/make-nk-internals-public

zcash_primitives: Make `NullifierDerivingKey` internals public

zcash_primitives/src/sapling.rs

@@ -192,7 +192,7 @@ impl ProofGenerationKey {
 
 /// A key used to derive the nullifier for a Sapling note.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
-pub struct NullifierDerivingKey(pub(crate) jubjub::SubgroupPoint);
+pub struct NullifierDerivingKey(pub jubjub::SubgroupPoint);
 
 #[derive(Debug, Clone)]
 pub struct ViewingKey {