Cabal revisions of Gamgine-0.4

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

 name: Gamgine version: 0.4+x-revision: 1 cabal-version: >=1.6 build-type: Simple license: BSD3         zlib >=0.5.4.1 && <0.6,         ListZipper >=1.2.0.2 && <1.3,         composition >=1.0.1.0 && <1.1+    build-tools:+        cpphs >=1.18.4 && <1.19     exposed-modules:         Gamgine.Coroutine         Gamgine.Bool