- Drop _service: no longer needed, since upstream is back in
releasing tarballs mode.

- Update to version 0.12.0:
+ Enhancements included:
- Improvements in:
. Inserting links in rich text messages (interface).
. Displaying conversations (interface).
. Moving and labelling conversations (interface).
. Support for right-to-left languages.
. Keyboard navigation for conversations.
. Security when displaying messages.
- Insert images inline when composing rich text messages.
- Added in-application keyboard shortcut help (Ctrl + ?).
- Choose multiple spell-checker languages when composing
messages.
- Support message archiving for Yahoo! Mail and Outlook.com.
- Automatically unfold starred messages in a conversation.
- Support saving remote inline images.
- Support for distribution via Flatpak.
- Numerous bug fixes and minor user interface improvements.
+ Updated manual translations.
+ Updated translations.
- Drop %desktop_database_*, %icon_theme_cache_* and
%glib2_gsettings_schema_* post/postun/requires: functionality now
covered by file triggers. (forwarded request 531260 from dimstar)