feat: add block hash to BlockResponse

Reviewed-on: https://git.vergara.tech///Vergara_Tech/zcash-haskell/pulls/92

src/ZcashHaskell/Types.hs

@@ -256,7 +256,8 @@ instance FromJSON RpcError where
 -- ** `zcashd`
 -- | Type to represent response from the `zcashd` RPC `getblock` method
 data BlockResponse = BlockResponse
-  { bl_confirmations :: !Integer -- ^ Block confirmations
+  { bl_hash :: !HexString
+  , bl_confirmations :: !Integer -- ^ Block confirmations
   , bl_height :: !Integer -- ^ Block height
   , bl_time :: !Integer -- ^ Block time
   , bl_txs :: ![HexString] -- ^ List of transaction IDs in the block
@@ -269,7 +270,8 @@ instance FromJSON BlockResponse where
       h <- obj .: "height"
       t <- obj .:? "time"
       txs <- obj .: "tx"
-      pure $ BlockResponse c h (fromMaybe 0 t) txs
+      hash <- obj .: "hash"
+      pure $ BlockResponse hash c h (fromMaybe 0 t) txs
 
 -- | Type to represent response from the `zcashd` RPC `getrawtransaction`
 data RawTxResponse = RawTxResponse