Update submodules: plugins (new commits)

plugins:
    ed6e382 Greg Holmes <greg@dmdirc.com>
            Select an alias when deleting one.

            Fixes-Issue: CLIENT-517
            Gerrit: http://gerrit.dmdirc.com/3631

Change-Id: Ic9355b5d8fecb73279c3aa50fe1ed4a2a117b8fb