Update submodules: plugins (new commits)

plugins:
    dc6914b Greg Holmes <greg@dmdirc.com>
            Use event bus more.

            Gerrit: http://gerrit.dmdirc.com/3256

Change-Id: I0ffbac538547572d39e3c715cfd04cb8c2949eda
Update submodules: plugins (new commits)

plugins:
    3274830 Greg Holmes <greg@dmdirc.com>
            Remove some deprecated method usages.

            Gerrit: http://gerrit.dmdirc.com/3262

Change-Id: I57a924d21a264527c4955e38a7bcd435f8afde2a