fixMaxHealth

[MikeMMattinson]

    public void ActivatePowerUp(string powerUp){
        if(powerUp == "AttackUp"){
            this.attack += 3;
        }
        if(powerUp == "HealthUp"){

            // check no more than 100
            this.health += 20;

            if(this.health > 100) {
                this.health = 100;
            }

        }

        if(powerUp == "DefenseUp"){

            // check no more than 100
            this.defense += 2;

        }
    }