code: private static List<String> loadRenameFile(URL url) throws IOException {
          try (BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream(), UTF_8))) {
              return reader.lines()
                      .filter(line -> !line.isEmpty() && !line.startsWith("#"))
                      .collect(toList());
          }
      }
docs: loads a single rename file