getText(url, encoding) {
    var decodededUrl = window.decodeURIComponent(url.substr(1)); // Remove first slash

    var entry = this.zip.file(decodededUrl);

    if (entry) {
      return entry.async("string").then(function (text) {
        return text;
      });
    }
  }
Get Text from Archive by Url
@param  {string} url
@param  {string} [encoding]
@return {string}