0.941:
* Added explosion sound effect.
* Added grass texture.

0.94:
* Added possibility to enable/disable joystick support.
* Added music to the game.

0.93:
* Added explosions

0.922
* Added a hack that removes another bug in customizable controls, but
  also removes some functionality.

0.921:
* Fixed a bug in customizable controls.

0.92:
* Added customizable controls
* Added joystick support

0.91:
* Tweaked the controls a bit to make aiming better

0.9:
* First version