For example notmuch Emacs client can now have these headers visible
when the headers are added to the `notmuch-message-headers` variable.
+Emacs Interface
+---------------
+
+Removal of the deprecated `notmuch-folders` variable
+
+ `notmuch-folders` has been deprecated since the introduction of saved
+ searches and the notmuch hello view in notmuch 0.3. `notmuch-folders`
+ has now been removed. Any remaining users should migrate to
+ `notmuch-saved-searches`.
+
Library changes
---------------