code: public SagaModuleBuilder addHandlerAnnotation(final Class<? extends Annotation> annotationClass) {
          Objects.requireNonNull(annotationClass, "The type of annotation is not allowed to be null");
          handlerAnnotations.add(annotationClass);
          return this;
      }
docs: Adds a custom annotation to be used when scanning for handler methods
  to continue an existing saga. By default the {@link com.codebullets.sagalib.EventHandler} annotation
  will be used.