Missing @Override

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@829360 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/lang/builder/HashCodeBuilder.java

@@ -977,6 +977,7 @@ public int toHashCode() {
      * 
      * @return <code>hashCode</code> based on the fields appended
      */
+    @Override
     public int hashCode() {
         return toHashCode();
     }