docs: improve game loop

game-loop/src/main/java/com/iluwatar/gameloop/Bullet.java

@@ -24,22 +24,19 @@
  */
 package com.iluwatar.gameloop;
 
+import lombok.Getter;
+import lombok.Setter;
+
 /**
  * Bullet object class.
  */
 public class Bullet {
 
+  @Getter
+  @Setter
   private float position;
 
   public Bullet() {
     position = 0.0f;
   }
-
-  public float getPosition() {
-    return position;
-  }
-
-  public void setPosition(float position) {
-    this.position = position;
-  }
 }