Update main.py, readme.txt, scoreboard.txt, sound/bullet.mp3, sound/explosion.wav, sound/explosion_spaceship.wav, image/alien1.png, image/alien2.png, image/alien3.png, image/boss.png, image/bullet_enemy.png, image/bullet_player.png, image/exit.png, image/exp1.png, image/exp2.png, image/exp3.png, image/exp4.png, image/space.jpg, image/spaceship.png files