Log Message:
feed2exec: update to 0.22.0. Changes:

* cleanups:
  * add renovate bot
  * start using tox --current-env
  * use debputy reformat for control files, no change
  * silence flake8 warnings
  * fix test collection in pytest 3.8+
  * chase new html2text in test suite
  * drop support for Python < 3.8
  * note the existence of markdownify
  * fix deprecation warning: get rid of dateparser feature detection
  * fix test suite failures due to deprecation warnings
  * fix a new mypy warning on old code
  * note that 0.21 was only published on pypi
* ikiwikitoot: add tool bypass RSS feed parsing altogether
* fix error in handling toot error codes