RSS feed cannot be downloaded by newsboat and wget.
I could download https://nitter.unixfox.eu/TwitterAccount/rss from firefox, but when newsboat and wget try to download it, HTTP 403 error occurs.

I want to read RSS feeds on newsboat.

With curl, I get
```
<html>
<head><title>403 Forbidden</title></head>
<body>
<center><h1>403 Forbidden</h1></center>
<hr><center>nginx</center>
</body>
</html>
```