fix build deps for cryptography

src/32-cryptography/Merkle.hs

@@ -25,7 +25,7 @@ merkleRoot hs  = joinHash (merkleRoot left) (merkleRoot right)
     (left, right) = splitAt i hs
     i = until (\x -> x*2 >= length hs) (*2) 1
 
-tree :: Digest SHA256
+tree :: Hash
 tree = merkleRoot $ map hash (["4", "8", "15", "16", "23", "42"] :: [B.ByteString])
 
 file :: IO ()

src/32-cryptography/example.cabal

@@ -13,7 +13,7 @@ library
   build-depends:       
     base            >= 4.6 && <4.10,
     bytestring      >= 0.10 && <0.11,
-    cereal          -any,
+    cereal          >= 0.5 && <0.6,
     cryptonite      >= 0.19 && <0.21
 
   default-language:    Haskell2010