Relax upper bound for hslua

Allow hslua-2.2.0.

Author: tarleb

hslua-module-doclayout.cabal

@@ -30,7 +30,7 @@ source-repository head
 library
   build-depends:       base           >= 4.9 && < 5
                      , doclayout      >= 0.2 && < 0.4
-                     , hslua          >= 2.1 && < 2.2
+                     , hslua          >= 2.1 && < 2.3
                      , text           >= 1.0 && < 1.3
   default-language:    Haskell2010
   hs-source-dirs:      src