Update submodules: plugins (new commits)

plugins:
    87ee148 Greg Holmes <greg@dmdirc.com>
            Fix some errors in the PMD.

            Validate profile names for uniqueness as well as filenames.
            Remove spaces from auto generated nickname on creation of profile.

            Fixes-Issue: CLIENT-461
            Fixes-Issue: CLIENT-462
            Gerrit: http://gerrit.dmdirc.com/3206

Change-Id: Ia6735b29a473bacbd87672605c0db204bf160847