v0.3.1: fixed a bug where pitfall traps wouldn't disappear when turning into a pit tile.

src/com/shatteredpixel/shatteredpixeldungeon/levels/traps/PitfallTrap.java

@@ -81,6 +81,7 @@ public class PitfallTrap extends Trap {
 			}
 
 			sprite.parent.add(new WindParticle.Wind(pos));
+			sprite.killAndErase();
 			GameScene.updateMap( pos );
 		}
 	}