Cabal revisions of arrows-0.3

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

 Name:           arrows Version:        0.3-Build-Depends:  base >= 2.0, Stream+x-revision: 1+Build-Depends:  base >= 2.0 && < 3.1, Stream Build-Type:     Simple License:        BSD3 license-file:   LICENSE