Update submodules: plugins (new commits)

plugins:
    3df1cb1 Chris Smith <chris@dmdirc.com>
            Tidy up the URL config panel.

            Gerrit: http://gerrit.dmdirc.com/3132

Change-Id: I1a82fc59453d05984ee9418d0bdcefd84550dc4e
Update submodules: plugins (new commits)

plugins:
    0379847 Greg Holmes <greg@dmdirc.com>
            Fix some oddities in the new PMD

            Gerrit: http://gerrit.dmdirc.com/3131

Change-Id: Ib69a1bb2691b09be77583d2e480db73f78795550