code: private static void mergeWordsWithOldDic() {
          List<String> sources = new ArrayList<>();
          sources.add("target/dic.txt");
          sources.add("src/main/resources/dic.txt");
          String target = "src/main/resources/dic.txt";
          try {
              DictionaryTools.merge(sources, target);
          } catch (IOException ex) {
              LOGGER.info("和现有词典合并失败：", ex);
          }
      }
docs: 和旧的词典进行合并