Cabal revisions of dstring-0.3

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

 Name:               dstring Version:            0.3+x-revision: 1 Synopsis:           Difference strings. Description:   Difference strings: a data structure for O(1) append on  Library   Build-Depends:     base == 4.*-                   , dlist == 0.*+                   , dlist >= 0.3.2 && < 0.6                    , to-string-class == 0.*   Exposed-modules: Data.DString   Ghc-options:     -O2 -Wall