Disable shooting self(helps on laggy servers)

bullet.go

@@ -14,6 +14,7 @@ type Bullet struct {
 	direction  uint8
 	color      color.Color
 	super      bool
+	ownerID    uint32
 	id         uint32
 }
 
@@ -159,6 +160,9 @@ func (bullet *Bullet) tick(gameMap *GameMap,
 	}
 	hitPlayer := false
 	for _, player := range players {
+		if player.playerID == bullet.ownerID {
+			continue
+		}
 		if hitPlayer {
 			break
 		}