Update submodules: plugins (new commits)

plugins:
    8fd14f8 Greg Holmes <greg@dmdirc.com>
            YAY JVM Bugs.

            Gerrit: http://gerrit.dmdirc.com/3794

    e8895aa Chris Smith <chris@dmdirc.com>
            Add an EDT handler invocation.

            This allows MBassador handlers to be executed nicely on the EDT.

            Gerrit: http://gerrit.dmdirc.com/3795

Change-Id: Icc6330ca6fcfbc613d00beb8874fd911185fcbb5