How to set up an iTunes podcast?
Just because there hasn't been a commit for ages doesn't mean it's totally not worth investigating further - as you say the tags are not complicated so probably that hasn't changed.

I had a quick look and the first issue on the issue queue is for the 8 version and it's to do with how libraries are loaded, which I believe did change as 8 moved along. Someone's posted a patch in Dec 16 so not that long ago and it's marked as 'needs review', so best would be to try it out and report back there as to whether that works or not, if so and something else doesn't work then create another issue if you can't fix it yourself, or post another patch if you can.

If you use composer to install Drupal 8, for example using:
https://github.com/drupal-composer/drupal-project

then you can also apply the patch in the patches section of your composer.json by adding the link to the patch so it can find it:
https://www.drupal.org/files/issues/views_rss_itunes-fatal_error_call_to_undefined_function_libraries_load-2839012-3.patch

This is kinda how it works - if you wait it may never arrive, and if you can't do the above it's all googleable skills.