Update submodules: plugins (new commits)

plugins:
    446ab2b Chris Smith <chris@dmdirc.com>
            Get rid of nice, useful J8 method.

            Gerrit: http://gerrit.dmdirc.com/3505

Change-Id: I9243b595dd0cf35156591bdc1246a0afd63c5b51
Update submodules: plugins (new commits)

plugins:
    aa61a7e Shane Mc Cormack <shane@dmdirc.com>
             Get rid of nice, useful J8 method. #2

            Gerrit: http://gerrit.dmdirc.com/3506

Change-Id: I1d3e9e0202a6cc1214016b8180ed652fc148cfac