Cabal revisions of pipes-safe-2.2.3

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

 Name: pipes-safe
 Version: 2.2.3
+x-revision: 1
 Cabal-Version: >=1.8.0.2
 Build-Type: Simple
 License: BSD3
 
 Library
     Build-Depends:
-        base              >= 4       && < 5  ,
+        base              >= 4.6     && < 5  ,
         containers        >= 0.3.0.0 && < 0.6,
         exceptions        >= 0.6     && < 0.9,
         mtl               >= 2.1     && < 2.3,