Use the new getXMonadCacheDir function from #62
Use the new getXMonadCacheDir function from #62

Prompt should have been using getXMonadDir this entire time but since
we now have getXMonadCacheDir use that instead.  This brings
xmonad-contrib inline with the changes in #62.

This also fixes xmonad/xmonad-contrib#68

f1u77y/xmonad-contrib,f1u77y/xmonad-contrib,xmonad/xmonad-contrib,xmonad/xmonad-contrib