Relaxed upper version bound for transformers.

Author: svenpanne

GLURaw.cabal

@@ -45,7 +45,7 @@ library
   hs-source-dirs: src
   build-depends:
     base         >= 4   && < 5,
-    transformers >= 0.2 && < 0.5,
+    transformers >= 0.2 && < 0.6,
     OpenGLRaw    >= 2.4 && < 2.7
   default-language: Haskell2010
   ghc-options: -Wall