Merge pull request 'Add nullifier field to DecodedNote' (#60) from rav001 into dev040

Reviewed-on: #60

src/ZcashHaskell/Types.hs

@@ -616,6 +616,7 @@ data DecodedNote = DecodedNote
   { a_value :: !Int64 -- ^ The amount of the transaction in _zatoshis_.
   , a_recipient :: !BS.ByteString -- ^ The recipient Orchard receiver.
   , a_memo :: !BS.ByteString -- ^ The decoded shielded memo field.
+  , a_nullifier :: !HexString -- ^ The calculated nullifier
   } deriving stock (Eq, Prelude.Show, GHC.Generic)
     deriving anyclass (SOP.Generic, SOP.HasDatatypeInfo)
     deriving anyclass (Data.Structured.Show)