Cabal revisions of turtle-1.2.4

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

 Name: turtle Version: 1.2.4+x-revision: 1 Cabal-Version: >=1.10 Build-Type: Simple License: BSD3 Library     HS-Source-Dirs: src     Build-Depends:-        base                 >= 4.5     && < 5  ,+        base                 >= 4.6     && < 5  ,         async                >= 2.0.0.0 && < 2.1,         clock                >= 0.4.1.2 && < 0.7,         directory            >= 1.0.7   && < 1.3,