Release Newsboat 2.30

Lists below only mention user-visible changes, but the full list of
contributors for this release also includes: Arttano, Danny Kirkham,
Juho Eerola, and Pepe Doval.

Added
=====

- In config, long lines can now be broken into multiple ones with `\`. When
    parsing the config, Newsboat would remove the backslash and append the
    following line to the current one. Be careful when indenting the lines that
    follow the backslash, as the indentation will be included in the
    concatenated string; this can change the meaning of some commands, e.g. if
    the indentation ends up inside a regex (#2212) (Simon Farre)
- `article-feed` operation, to go to the feed of the currently selected article.
    This can come in handy in query feeds (phire)
- New placeholder for `browser`, `%T`, which is replaced by the title of the
    selected feed or item (#2224) (Aneesh)
- Miniflux: fail on startup if credentials are wrong (#2220) (Dennis van der
    Schagt)
- Miniflux: support for API token authentication, which is available since
    Miniflux 2.0.21 and is the preferred authentication method:
    https://miniflux.app/docs/api.html#authentication See `miniflux-token`,
    `miniflux-tokeneval`, and `miniflux-tokenfile` settings (#2122) (Dennis van
    der Schagt)

Changed
=======

- Bumped minimum supported Rust version to 1.62.0
- When `cleanup-on-quit` is disabled and the cache contains unreachable feeds,
    print their number, and write their URLs to `error-log` (#1548) (Maximilian
    Winkler)
- If an item contains enclosure(s) but doesn't specify their type(s), pick the
    last one (as Newsboat only displays a single enclosure per item). This won't
    always do the right thing, e.g. it could pick cover art instead of the
    podcast, but *sometimes* it will, so it's still better than nothing (#2050)
    (Dennis van der Schagt)
- Updated translations: Dutch (Dennis van der Schagt), German (Lysander
    Trischler), Italian (Mauro Scomparin), Polish (Carno), Russian (Alexander
    Batischev), Turkish (Emir SARI), Ukrainian (Alexander Batischev)
- Updated vendored library Catch2 to 2.13.10

Fixed
=====

- Atom: if an item doesn't specify the `atom:author`, use the field from the
    contained `atom:source`; if that's not specified either, use `atom:author`
    of the feed itself. This is dictated by RFC 4287 §4.2.1 (#2256) (Lysander
    Trischler)

Security
========

- Remove transitive dependency on the vulnerable `time` 0.1 crate:
    CVE-2020-26235 https://osv.dev/vulnerability/RUSTSEC-2020-0071 (#2288)
    (Alexander Batischev, thanks to the prod from critkitten)
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