Update to 6.0.6. From the changelog:

* Prevent an AttributeError that occurs when a server returns HTTP 3xx
  but doesn't include a Location header as well. (#267)
* Prevent a TypeError crash that may occur when including a username and
  password in the feed URL. (#276)
* Prevent a UnicodeDecodeError crash that may occur when the title
  element's type attribute exists but is empty. (#277)
* Prevent a UnicodeEncodeError crash that may occur if the URL contains
  Unicode characters in the path. (#273)
* Fix an issue with the HTTP request status on Python >= 3.9.

Updating during the freeze for the bugfixes.

(schmonz)