code: function gravatarURL(email) {
    var size = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 32;
    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : defaultOptions;
  
    var url = 'https://secure.gravatar.com/avatar/';
  
    if (isHash(email)) {
      url += email;
    } else {
      url += (0, _md2.default)(email.toLowerCase());
    }
  
    var qs = _queryString2.default.stringify(_extends({ s: size }, options));
    if (qs) {
      url += '?' + qs;
    }
  
    return url;
  }
docs: TODO cash gravatar URLs