code: public List<Role> getChangedRoles()
      {
          return changedPermHolders.stream()
                  .filter(p -> p instanceof Role)
                  .map(Role.class::cast)
                  .collect(Collectors.toList());
      }
docs: List of affected {@link net.dv8tion.jda.core.entities.Role Roles}
  
  @return List of affected roles