Data files are copied but remain unused

Cabal will invariably copy data files when the game is installed, but the game still expects to find them in $PWD/data/.

(The solution is trivial, but I don't like how it is approached in other platforms, so I'm not messing with this now. It's pure noise, from an educational standpoint.)

Author: ivanperez-keera

README.md

@@ -54,7 +54,8 @@ explanation.
 ## Limitations
 
 The game expects to find sources in ```data/```, inside the current
-working directory. Data files are not copied over when the game is installed.
+working directory. (That's true even though data files are copied
+over when the game is installed.)
 
 (If it bugs you too much, change the code to use the appropriate
 ```haskanoid_Paths``` functions when resources are loaded.)