Fix version number

ChangeLog.md

 # Changelog for horizon-spec
 
-## v0.1.0.0
+## v0.0.0.1
+
+* Initial Specification of Horizon data types.
+* Two different sources, `GitSource` and `HackageSource`.
+* `doJailbreak` and `doCheck` package `Modifiers`.

horizon-spec.cabal

@@ -5,7 +5,7 @@ cabal-version:      1.12
 -- see: https://github.com/sol/hpack
 
 name:               horizon-spec
-version:            0.1.0.0
+version:            0.0.0.1
 synopsis:           Short description of your package
 description:
   Please see the README on GitHub at <https://github.com/githubuser/ranger#readme>