xmonad-contrib.cabal: simplify xmonad dependency to >=0.10 && < 0.11
xmonad-contrib.cabal: simplify xmonad dependency to >=0.10 && < 0.11

Unless there is a particular reason for listing the lower and upper bounds
separately then this seems simpler and cleaner.


reenberg/XMonadContrib,reenberg/XMonadContrib