Add hashable upper bound

gothic.cabal

@@ -33,7 +33,7 @@ library
                     , binary               >= 0.8.5.1 && < 0.9
                     , connection           >= 0.2.8 && < 0.4
                     , exceptions           >= 0.10.0 && < 0.11
-                    , hashable             >= 1.4
+                    , hashable             >= 1.4.3 && < 1.5
                     , http-conduit         >= 2.3.2 && < 2.4
                     , http-client          >= 0.5.13.1 && < 0.8
                     , http-client-tls      >= 0.3.5.3 && < 0.4