Relax upper bound for hslua, allow hslua-1.2.*

Author: tarleb

hslua-module-system.cabal

@@ -36,7 +36,7 @@ library
                      , containers >= 0.5    && < 0.7
                      , directory  >= 1.3    && < 1.4
                      , exceptions >= 0.8    && < 0.11
-                     , hslua      >= 1.0.3  && < 1.2
+                     , hslua      >= 1.0.3  && < 1.3
                      , temporary  >= 1.2    && < 1.4
   default-extensions:  LambdaCase
   default-language:    Haskell2010