Release Newsboat 2.14

Lists below only mention user-visible changes, but I would also like to
acknowledge contributions from the following people: Paul Woolcock, Raphael
Nestler, Thanga Ayyanar A.

Added
=====

- Dependency on Rust 1.25+. The compiler (`rustc`) and the build tool (`cargo`)
    are required
- `download-filename-format` setting that controls how Podboat names the files.
    Default is the same as older versions of Podboat (Jagannathan Tiruvallur
    Eachambadi)
- `podlist-format` setting that controls formatting of the items on Podboat's
    main screen. Also, a `%b` format specifier that contains just the basename
    of the download (e.g. "podcast.mp3" instead of "/home/name/podcast.mp3")
    (zaowen)
- Human-readable message when Rust code panics (Alexander Batischev)
- `unbind-key -a`, which unbinds all keys (Kamil Wsół)

Changed
=======

- Look up `BROWSER` environment variable before defaulting to lynx(1) (Kamil
    Wsół) (#283)
- Strip query parameters from downloaded podcasts' names (i.e. name them as
    "podcast.mp3", not "podcast.mp3?key=19ad740") (Jagannathan Tiruvallur
    Eachambadi)
- Update translations: Russian, Ukrainian (Alexander Batischev), German
    (Lysander Trischler)
- Document that minimum supported CURL version is 7.21.6. This has been the case
    since 2.10, but wasn't documented at the time (Alexander Batischev)
- Update vendored version of nlohmann/json to 3.4.0
- Update vendored version of Catch2 to 2.5.0

Fixed
=====

- HTTP response 400 errors with Inoreader (Erik Li) (#175)
- Podboat's crash (segmentation fault) when parsing a comment in the queue file.
    Comments aren't really supported by Podboat since it overwrites the file
    from time to time, but the crash is still unacceptable (Nikos Tsipinakis)
- Newsboat displaying articles differently in "internal" and external pagers
    (Alexander Batischev)
- One-paragraph items not rendered at all (Alexander Batischev)
- Crash (segmentation fault) on feeds that don't provide a `url` attribute
    (ksunden)
- Hangs when `highlight` rule matches an empty string (zaowen)
- Article disappearing from the pager upon feed reload (zaowen)
    (https://github.com/akrennmair/newsbeuter/issues/534)
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