自动生成的description存在HTML标签

[yqs112358]

Check List

• I have already read README.
• I have already searched existing issues and they are not help to me.
• I examined error or warning messages and it's difficult to solve.
• I am using the latest version of this repository.
• I am using the latest version of Hexo.
• My Node.js is matched the required version.

Describe the bug

如下列rss.xml，可以看到文章的description中包含了本不该包含的标签
https://blog.openyq.top/rss.xml

Expected behavior

description中只包含纯文本内容

How to reproduce

1. 安装hexo-generator-feed
2. 部署博客

Screenshots

Environment information

- Hexo 7.3.0
- hexo-generator-feed 3.0.0

Additional context

_config.yaml相关配置：

# hexo-generate-feed (RSS)
feed:
  enable: true
  type:
    - atom
    - rss2
  path:
    - atom.xml
    - rss.xml
  limit: 0
  hub:
  content:
  content_limit: 140
  content_limit_delim: ' '
  order_by: -date
  icon: 
  autodiscovery: true
  template: