[Haskell-cafe] Update for type-level library (0.2.4)

Dear Haskell developers, A new version of the type-level library for type-level programming is pushed into the development repository and uploaded to the Hackage database. This is only a minor update to fix the compatibility issues with base 4, GHC>=6.10 and cabal-install (not backward compatible). Bests, Hosein Attarzadeh