Cabal revisions of transformers-0.5.0.1

Hackage metadata revisions edit the .cabal file after upload; each diff below is one revision.

 name:         transformers version:      0.5.0.1+x-revision: 1 license:      BSD3 license-file: LICENSE author:       Andy Gill, Ross Paterson   location: http://hub.darcs.net/ross/transformers  library+  -- Semigroup is a superclass of Monoid in base-4.11+  build-depends: base <4.11+   build-depends: base >= 2 && < 6   hs-source-dirs: .   if !impl(ghc>=7.9)