Correct license for L.CenteredMaster
Correct license for L.CenteredMaster

Context for why I've recorded the patch:
	aavogt | portnov: did you get the message about your XMonad.Layout.CenteredMaster licence being not compatible with the licence of contrib?
	portnov | aavogt: yep.  Could you change that yourself? I allow this to be distributed as bsd3. Making so small patch and sending it will get to much time :)
	portnov | *so
	aavogt | I can change it, its more about whether you would allow the change to be made                                                                       
	aavogt | but I guess this clears it up                                                                                                                       
	portnov | i allow. 


reenberg/XMonadContrib,reenberg/XMonadContrib