Update submodules: plugins (new commits)

plugins:
    14bbfdb Chris Smith <chris@dmdirc.com>
            Tidy some perfectly normal classes.

            I'm not insane. This isn't dangerous. /me runs

            Gerrit: http://gerrit.dmdirc.com/4080

Change-Id: I3661efe9bd84d37e539e0309ceb46fbaf4e1edc6