`Warning: Unknown prop `referrerPolicy` on <a> tag.`

`referrerPolicy` is defined by the WHATWG HTML for e.g. `a` elements (https://html.spec.whatwg.org/multipage/semantics.html#the-a-element). Also see https://w3c.github.io/webappsec-referrer-policy/

/**
 * Copyright 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule HTMLDOMPropertyConfig
 */
'use strict';
var DOMProperty = require('DOMProperty');
var MUST_USE_PROPERTY = DOMProperty.injection.MUST_USE_PROPERTY;
var HAS_BOOLEAN_VALUE = DOMProperty.injection.HAS_BOOLEAN_VALUE;
var HAS_NUMERIC_VALUE = DOMProperty.injection.HAS_NUMERIC_VALUE;
var HAS_POSITIVE_NUMERIC_VALUE =
  DOMProperty.injection.HAS_POSITIVE_NUMERIC_VALUE;
var HAS_OVERLOADED_BOOLEAN_VALUE =
  DOMProperty.injection.HAS_OVERLOADED_BOOLEAN_VALUE;
var HTMLDOMPropertyConfig = {
  isCustomAttribute: RegExp.prototype.test.bind(
    new RegExp('^(data|aria)-[' + DOMProperty.ATTRIBUTE_NAME_CHAR + ']*$')
  ),
  Properties: {
    /**
     * Standard Properties
     */