fix(neb): headers updated to match engine

Author: bouda1

neb/inc/com/centreon/engine/notification.hh

@@ -59,6 +59,8 @@ class notification {
   notifier::reason_type get_reason() const;
   uint32_t get_notification_interval() const;
   bool sent_to(const std::string& user) const;
+  void add_contacts(const std::set<std::string>& contact_notified);
+  const std::set<std::string>& get_contacts() const;
 };
 
 std::ostream& operator<<(std::ostream& os, notification const& obj);