ANNOUNCE: tumbler 4.21.1 released

[Gaël Bonithon]

tumbler 4.21.1 is now available for download from
  
  https://archive.xfce.org/src/xfce/tumbler/4.21/tumbler-4.21.1.tar.xz
  https://archive.xfce.org/src/xfce/tumbler/4.21/tumbler-4.21.1.tar.xz?sha1
  https://archive.xfce.org/src/xfce/tumbler/4.21/tumbler-4.21.1.tar.xz?sha256


What is tumbler?
================

Tumbler is a D-Bus service for applications to request thumbnails for
various URI schemes and MIME types. It is an implementation of the
thumbnail management D-Bus specification described on 

  https://www.freedesktop.org/wiki/Specifications/thumbnails/

written in an object-oriented fashion using GLib and GObject. Its
modular architecture makes it very flexible and useful in many
situations. It provides plugin interfaces for extending the URI schemes
and MIME types for which thumbnails can be generated as well as

for replacing the storage backend that is used to store the thumbnails
on disk. Tumbler's functionality can also be extended via specialized
thumbnailer services implemented in accordance to the thumbnail
management D-Bus specification.

Website: 
  https://docs.xfce.org/xfce/tumbler/start


Release notes for 4.21.1
========================
[Please note that this is a development release.]

- build: Rename POTFILES.in to POTFILES
- I18n: Update po/LINGUAS list
- build: Fix typo in optimization level
- gepub-thumbnailer: Get pixbuf in "area-prepared" signal handler
- gst-thumbnailer: Fix TumblerThumbnailFlavor leak
- I18n: Update po/LINGUAS list
- ffmpeg-thumbnailer: Update mime type list from upstream desktop file
- xdg-cache: Fix TumblerThumbnailFlavor leaks
- README.md: Add uninstall info
- cover-thumbnailer: Capture regex matchinfo for series episodes
- cover-thumbnailer: Update the base URL for TMDB
- cover-thumbnailer: Use correct parameter types with curl
- build: Remove old CHECK_VERSION preprocessor conditionals
- Update README after switchover to meson
- Remove autotools build
- meson-build: Use configure_file() to generate GNU visibility files
- gst-thumbnailer: Make mime type checking more flexible
- Translation Updates:
  Arabic, Esperanto, Occitan (post 1500), Thai, Uyghur, Vietnamese