Update the news about search using S-expression support to also say
that show is also now faster.
Instead of interleaving errors in search result buffers, search mode
now reports errors in the minibuffer.
-Faster search results
+Faster search and show
- Communication between search mode and the notmuch CLI is now more
+ Communication between Emacs and the notmuch CLI is now more
efficient because it uses the CLI's S-expression support. As a
- result, search mode should now fill search buffers faster.
+ result, search mode should now fill search buffers faster and
+ threads should show faster.
No Emacs 22 support