title: Add additional column in audit table with hibernate envers
body: <p>Is it possible to add additional column in audit table??
  For example i have a table like this</p>
  
  <pre><code>@Entity
  @Table(name="EmpEnverPrac")
  @Audited
  public class EmpEnverPractice {
  
  
          @Id
          @Column(name="ID") 
          @GeneratedValue(strategy  = GenerationType.AUTO)
          private Integer id; 
  
          @Column(name="NAME") 
          private String name; 
  
          @Column(name="password")
          @NotAudited
          private String password; 
  
       // getter and setters
  
  }
  </code></pre>
  
  <p>now i want some additional column in my generated audit table but i don't want to include them in my entity. I am not able to find any solution for this requirement. kindly tell me the required configuration. thanks in advance</p>