code: function checkSubtitleFiles(options, fileWithHashes) {
      if (options.verbose) {
          _utils.logger.info('Checking existing subtitles...');
      }
      var promises = [];
      var _iteratorNormalCompletion3 = true;
      var _didIteratorError3 = false;
      var _iteratorError3 = undefined;
  
      try {
          for (var _iterator3 = fileWithHashes[Symbol.iterator](), _step3; !(_iteratorNormalCompletion3 = (_step3 = _iterator3.next()).done); _iteratorNormalCompletion3 = true) {
              var file = _step3.value;
  
              promises.push(_utils.fileManager.subtitleExists(options, file));
          }
      } catch (err) {
          _didIteratorError3 = true;
          _iteratorError3 = err;
      } finally {
          try {
              if (!_iteratorNormalCompletion3 && _iterator3.return) {
                  _iterator3.return();
              }
          } finally {
              if (_didIteratorError3) {
                  throw _iteratorError3;
              }
          }
      }
  
      return Promise.all(promises);
  }
docs: Check if files exist. If --save flag is on then rename existing file
  @param {NapijsOptions} options
  @param fileWithHashes
  @returns {Promise}