bug fix

fixed the indices for a diagonal

Author: roundspecs

tic_tac_toe.py

@@ -6,7 +6,7 @@
     [0, 1, 2], [0, 3, 6],
     [3, 4, 5], [1, 4, 7],
     [6, 7, 8], [2, 5, 8],
-    [3, 5, 7], [0, 4, 8]
+    [2, 4, 6], [0, 4, 8]
 ]