'close()' does not close the board

[AlkisPis]

The instruction 'close()' does not close the board window or exits the program. It only terminates the run loop and passes the control to the code following 'baard.show()'.

Here's is a sample code:
`

from game2dboard import Board
from time import sleep

def onkey(key):
  if key == 'Escape': b.close()

b = Board(4,4) 
b.on_key_press = onkey
b.show()

print("Code continues ...")

sleep(3)  # During this pause, the board window is still open

Output:
Code continues ...`