Update submodules: plugins (new commits)

plugins:
    b3bc4cf Chris Smith <chris@dmdirc.com>
            Fix the URL Catcher plugin tests.

            Gerrit: http://gerrit.dmdirc.com/2684

Change-Id: Id7342bd5357f56b8f249ecfc79e7b7d7c2958caa
Update submodules: plugins (new commits)

plugins:
    5fdc06f Chris Smith <chris@dmdirc.com>
            Fix up debug command tests.

            Gerrit: http://gerrit.dmdirc.com/2683

Change-Id: I030b1409128919366e1f1eede4daafcb6408287e