Update answer copy as well

Author: atrocities

Day2/answers/spaceinvaders.py

@@ -137,10 +137,11 @@ def isSpent(self):
 
   keys = pygame.key.get_pressed()
   if keys[pygame.K_RIGHT]:
-      spaceship.moveRight()
+    spaceship.moveRight()
   if keys[pygame.K_LEFT]:
-      spaceship.moveLeft()
+    spaceship.moveLeft()
   if keys[pygame.K_SPACE]:
+    if len(player_missiles) == 0:
       spaceship.shoot()
 
   screen.fill(black)