Bump version to 0.2.0.0 now that sublibraries are public

Author: Mikolaj

horde-ad.cabal

@@ -20,7 +20,7 @@ name:               horde-ad
 -- PVP summary:     +-+------- breaking API changes
 --                  | | +----- non-breaking API additions
 --                  | | | +--- code changes with no API change
-version:            0.1.0.0
+version:            0.2.0.0
 
 -- A short (one-line) description of the package.
 synopsis:           Higher Order Reverse Derivatives Efficiently - Automatic Differentiation