docs: update version number

version-number/src/main/java/com/iluwatar/versionnumber/Book.java

@@ -24,19 +24,21 @@
  */
 package com.iluwatar.versionnumber;
 
+import lombok.Getter;
+import lombok.Setter;
+
 /**
  * Model class for Book entity.
  */
+@Getter
+@Setter
 public class Book {
   private long id;
   private String title = "";
   private String author = "";
-
   private long version = 0; // version number
 
-  public Book() {
-
-  }
+  public Book() {}
 
   /**
    * We need this copy constructor to copy book representation in {@link BookRepository}.
@@ -47,36 +49,4 @@ public class Book {
     this.author = book.author;
     this.version = book.version;
   }
-
-  public long getId() {
-    return id;
-  }
-
-  public void setId(long id) {
-    this.id = id;
-  }
-
-  public String getTitle() {
-    return title;
-  }
-
-  public void setTitle(String title) {
-    this.title = title;
-  }
-
-  public String getAuthor() {
-    return author;
-  }
-
-  public void setAuthor(String author) {
-    this.author = author;
-  }
-
-  public long getVersion() {
-    return version;
-  }
-
-  public void setVersion(long version) {
-    this.version = version;
-  }
 }