Cabal revisions of graphviz-2999.18.0.0

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

 Name:               graphviz Version:            2999.18.0.0+x-revision: 1 Stability:          Beta Synopsis:           Bindings to Graphviz for graph visualisation. Description: {  Library {         Default-Language:  Haskell2010+        other-extensions:  MonadComprehensions          Build-Depends:     base == 4.*,                            containers,