Fixed bug in shuffle algorithm

Author: nickgammon

lua/commas.lua

@@ -152,7 +152,7 @@ shuffle (cards)
 function shuffle(t)
   local n = #t
 
-  while n > 2 do
+  while n >= 2 do
     -- n is now the last pertinent index
     local k = math.random(n) -- 1 <= k <= n
     -- Quick swap