notmuch release 0.23.1 now available

[David Bremner]

Where to obtain notmuch 0.23.1
===========================
  https://notmuchmail.org/releases/notmuch-0.23.1.tar.gz

Which can be verified with:

  https://notmuchmail.org/releases/notmuch-0.23.1.tar.gz.sha1
  556cd9dc0236256e19fa31cbfef79e25157cd69f  notmuch-0.23.1.tar.gz

  https://notmuchmail.org/releases/notmuch-0.23.1.tar.gz.sha1.asc
  (signed by David Bremner)

What's new in notmuch 0.23.1
=========================

General
-------

Require Xapian >= 1.2.6

  The ifdef branch for older Xapian (pre-compact API) had bit-rotted.

Emacs
-----

Fix default colours for unread and flagged messages

  In 0.23 the default colours for unread and flagged messages in
  search view were accidentally swapped. This release returns them to
  the original colours.

  A related change in 0.23 broke the customize widget for
  notmuch-search-line-faces. This is now fixed.

Fix test failure with Emacs 25.1

  A previously undiscovered jit-lock related bug was exposed by Emacs
  25, causing a notmuch-show mode test to fail. This release fixes the
  bug, and hence the test.

What is notmuch
===============
Notmuch is a system for indexing, searching, reading, and tagging
large collections of email messages in maildir or mh format. It uses
the Xapian library to provide fast, full-text search with a convenient
search syntax.

For more about notmuch, see https://notmuchmail.org