Inoreader does not recognize rss

When I use node-rss to generate RSS, the generated RSS can not be recognized by Inoreader. Here's my code:

```javascript
let feed = new RSS({
title: username,
description: `${username}/${reposName}'s issue`,
feed_url: `https://${SELF_DOMAIN}/${encodeURIComponent(url)}/feed`,
site_url: url
})

issues.forEach((issue, index) => feed.item({
title: issue.title,
description: issue.description,
url: url,
author: issue.author,
date: issue.date,
guid: issue.guid
})
)

return feed.xml()
```

But can be detected on validator.w3.org/feed. My code is also written in accordance with the demo given on README. Here is my RSS content.

```xml

<![CDATA[mrcodehang]]>

https://github.com/mrcodehang/blog-comment/issues
RSS for Node
Fri, 12 May 2017 08:49:06 GMT


<![CDATA[以通俗的方式理解关键渲染路径]]>
https://blog.mrcodex.com/learn-the-critical-render-path-is-easy/

]]>
https://github.com/mrcodehang/blog-comment/issues
2017-04-07T18:27:32Z

Fri, 07 Apr 2017 18:27:32 GMT


<![CDATA[React的10种设计模式]]>
https://blog.mrcodex.com/react-ten-design-pattern/

]]>
https://github.com/mrcodehang/blog-comment/issues
2017-04-06T17:18:35Z

Thu, 06 Apr 2017 17:18:35 GMT


<![CDATA[成为一名认证"老司机"]]>
https://blog.mrcodex.com/become-a-authenticate-old-driver/

]]>
https://github.com/mrcodehang/blog-comment/issues
2017-04-06T17:11:22Z

Thu, 06 Apr 2017 17:11:22 GMT


<![CDATA[JS函数式浅析]]>
https://blog.mrcodex.com/javascript-functional-programming-analysis/

]]>
https://github.com/mrcodehang/blog-comment/issues
2017-04-11T04:08:48Z

Thu, 06 Apr 2017 17:10:09 GMT


<![CDATA[find-github-star 开发历程~]]>
https://blog.mrcodex.com/find-github-star-developer-road/

]]>
https://github.com/mrcodehang/blog-comment/issues
2017-04-06T16:53:58Z

Thu, 06 Apr 2017 16:52:13 GMT


<![CDATA[find-github-star 开发历程~]]>
https://blog.mrcodex.com/find-github-star-developer-road/

]]>
https://github.com/mrcodehang/blog-comment/issues
2017-04-06T16:51:46Z

Thu, 06 Apr 2017 16:51:46 GMT

```