- Cleanup specfile
+ expand Sources to be more human parseable
+ use signature of upstream tarball instead

- Update source to notmuch 0.29
* Add "body:" field to allow searching for terms that occur only
in the message body. Users will need to reindex their mail
to take advantage of this feature.
* Add support for indexing user specified headers (e.g. List-Id).
See notmuch-config(1)
* Add support for gzip compressed mail messages
* Notmuch is now capable of indexing, searching and rendering
cryptographically-protected Subject: headers
* emacs:
+ Bind B to browse URLs in current message.
+ Bind g to refresh the current notmuch buffer.
+ Forwarded messages are now tagged as +forwarded
+ Add references header to link forwarded message to thread of
original message.
+ The minimum supported major version of Emacs is now 24.
+ Support for GNU Emacs older than 25.1 is deprecated
- Switch to .xz upstream archive
- Bump minimum dependency for gmime to 3.0, thus dropping support for
openSUSE Leap 42.3