Bump version (#57)

Author: jhb563

haskellings.nix

@@ -4,7 +4,7 @@
 }:
 mkDerivation {
   pname = "haskellings";
-  version = "0.8.0.0";
+  version = "0.9.0.0";
   src = ./.;
   isLibrary = true;
   isExecutable = true;

package.yaml

@@ -1,5 +1,5 @@
 name:                haskellings
-version:             0.8.0.0
+version:             0.9.0.0
 github:              "MondayMorningHaskell/haskellings"
 license:             BSD3
 author:              "James Bowen"

src/Haskellings/Constants.hs

@@ -45,7 +45,7 @@ ghcVersionNumber = "8.10.4"
 
 -- | The current Haskellings program version.
 haskellingsVersion :: String
-haskellingsVersion = "0.8.0.0"
+haskellingsVersion = "0.9.0.0"
 
 -- | The project root directory name. We need to find the project root
 --   in order to locate the exercises.