code: public void addStartSagaAnnotation(final Class<? extends Annotation> annotationClass) {
          Objects.requireNonNull(annotationClass, "The type of annotation is not allowed to be null");
          startSagaAnnotations.add(annotationClass);
      }
docs: Adds a custom annotation to be used when scanning for methods
  starting a new saga. By default the {@link com.codebullets.sagalib.StartsSaga} annotation
  will be used.