allow new cabal

Author: glguy

config-value.cabal

@@ -48,7 +48,7 @@ library
 
   build-tool-depends:
     alex:alex   >= 3.2,
-    happy:happy >= 1.19 && <2.2,
+    happy:happy >= 1.19 && <2.3,
 
   hs-source-dirs:      src
   default-language:    Haskell2010