Log Message:
notmuch: update to 0.25.2.

Notmuch 0.25.2 (2017-11-05)
===========================

Command Line Interface
----------------------

Fix segfault in notmuch-show crypto handling when compiled against
GMime 2.6; this was a regression in 0.25.

General
-------

Support for GMime before 3.0 is now deprecated, and will be removed in
a future release.