Release Newsboat 2.17.1

Added
=====
- Mention that `cookie-cache` setting uses Netscape file format (Alexander
    Batischev on a prod from f-a)

Changed
=======
- Update German translation (Lysander Trischler)

Fixed
=====
- Feeds not updating when `max-items` is set (#650). This negates some of the
    performance improvement we got in 2.17, but we haven't measured how much;
    it's guaranteed to not be any slower than 2.16.1 (Alexander Batischev)
- Failing to start if config contains `#` that doesn't start a comment, e.g.
    inside regular or filter expression (#652) (Alexander Batischev)
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