`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/

dateTime: 0,
    default: HAS_BOOLEAN_VALUE,
    defer: HAS_BOOLEAN_VALUE,
    dir: 0,
    disabled: HAS_BOOLEAN_VALUE,
    download: HAS_OVERLOADED_BOOLEAN_VALUE,
    draggable: 0,
    encType: 0,
    form: 0,
    formAction: 0,
    formEncType: 0,
    formMethod: 0,
    formNoValidate: HAS_BOOLEAN_VALUE,
    formTarget: 0,
    frameBorder: 0,
    headers: 0,
    height: 0,
    hidden: HAS_BOOLEAN_VALUE,
    high: 0,
    href: 0,
    hrefLang: 0,
    htmlFor: 0,
    httpEquiv: 0,
    icon: 0,
    id: 0,
    inputMode: 0,
    integrity: 0,
    is: 0,
    keyParams: 0,
    keyType: 0,