Update ttt3.py

Author: Maurits van der Schee

ttt3.py

@@ -1,4 +1,8 @@
 # coding=UTF8
+
+# Python TicTacToe game with Tk GUI and minimax AI
+# Author: Maurits van der Schee <[email protected]>
+
 import sys
 if sys.version_info >= (3, 0):
   from tkinter import Tk, Button