refactoring: fix player can not die when attacking the guard

src/main/java/game/StartDarkSoulsGame.java

@@ -177,6 +177,9 @@ public class StartDarkSoulsGame {
 				+ "Guard fought back with sowrd of ashina "
 				+ "\n(you recieve 3 damage) ");
 		playerHP = playerHP -3;
+		if (playerHP == 0) {
+			lose();
+		}
 		hpLabelNumber.setText(""+ playerHP);
 		choice1.setText(">"); 
 		choice2.setText("");