Merge pull request #3 from gregcorbett/exit_code_fix

pygame-lesson1.py: Return an exit code of 0 on an expected exit

Author: norealroots

PythonLessons/PyGame/pygame-lesson1.py

@@ -43,4 +43,4 @@
         # Check to see if the "Close" button has been pressed
         if event.type == pygame.QUIT:
             pygame.quit()
-            sys.exit(1)
+            sys.exit(0)