Update submodules: plugins (new commits)

plugins:
    1ffacc8 Chris Smith <chris@dmdirc.com>
            Remove usages of deprecated info message.

            Also minor tidying up.

            Gerrit: http://gerrit.dmdirc.com/3088

Change-Id: I93b479056693fbbd8aadca95702260934e3a2624
Remove old method.

Change-Id: I1e0f181008b631f4245ce0afb024397d665a108e
Reviewed-on: http://gerrit.dmdirc.com/3089
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager