Cabal revisions of transformers-0.6.0.4

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

 name:         transformers version:      0.6.0.4+x-revision: 1 license:      BSD3 license-file: LICENSE author:       Andy Gill, Ross Paterson  library   default-language: Haskell2010-  build-depends: base >= 2 && < 6+  build-depends: base >= 4.13 && < 6   hs-source-dirs: .   if !impl(ghc>=7.9)     -- Data.Functor.Identity was moved into base-4.8.0.0 (GHC 7.10)