docs: public static Set<Class<?>> scanPackageByAnnotation(String packageName, final Class<? extends Annotation> annotationClass) {
  		return scanPackage(packageName, new Filter<Class<?>>() {
  			@Override
  			public boolean accept(Class<?> clazz) {
  				return clazz.isAnnotationPresent(annotationClass);
  			}
  		});
  	}