Update submodules: plugins (new commits)

plugins:
    cf39551 Chris Smith <chris@dmdirc.com>
            Remove some deprecated methods.

            Gerrit: http://gerrit.dmdirc.com/3285

Change-Id: I938b60468d24fac37c0b9b883fd601741e33864b
Update submodules: plugins (new commits)

plugins:
    ee7af7e Chris Smith <chris@dmdirc.com>
            Remove some deprecated methods.

            Gerrit: http://gerrit.dmdirc.com/3286

Change-Id: Iba4df11e05bd2b481eb07cb1a9f6d6f5da31b356