Remove upper Cabal bound

This enables building with the 3.6 series of Cabal-install.

Author: ysangkok

HDBC-postgresql.cabal

@@ -21,7 +21,7 @@ Build-Type: Custom
 Cabal-Version: >=1.10
 
 custom-setup
-  setup-depends: Cabal >= 1.8 && < 3.5, base < 5
+  setup-depends: Cabal >= 1.8, base < 5
 
 Flag splitBase
   description: Choose the new smaller, split-up package.