This bump is because of the new symbols introduced by the atomicity
patches.
# the time of release for any additions to the library interface,
# (and when it is incremented, the release version of the library should
# be reset to 0).
-LIBNOTMUCH_VERSION_MINOR = 3
+LIBNOTMUCH_VERSION_MINOR = 4
# The release version the library interface. This should be incremented at
# the time of release if there have been no changes to the interface, (but