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Rate Limit

You probably noticed that the weapon on the ship is currently as overpowered as the original Zerg rush. Let's fix that.

Assignment

Create a new variable in the Player constructor to act as a shot cooldown timer. It should start with a value of 0.
Create a new PLAYER_SHOOT_COOLDOWN_SECONDS constant and set it to 0.3.
When the player tries to shoot:
1. If the current value of the timer is greater than 0, prevent the player from shooting.
2. Otherwise, set the timer equal to PLAYER_SHOOT_COOLDOWN_SECONDS.
Every time update is called on the player, decrease the shoot timer by dt (the change in time).
Run your game for at least a few seconds, shooting to your heart's content. You should now be rate-limited to one shot every 0.3 seconds.

Bullets should still pass through asteroids without any consequences. We'll fix that soon.

If things seem to be working, run and submit the CLI tests.