Update submodules: plugins (new commits), util (new commits)

plugins:
    d3f6d41 Greg Holmes <greg@dmdirc.com>
            Fix Logging plugin for new ReverseFileReader.

            Depends-On: I921a395e088846216650d1ac14207cb915a6bb8c
            Gerrit: http://gerrit.dmdirc.com/4046

util:
    87e3c13 Greg Holmes <greg@dmdirc.com>
            Make ReverseFileReader use Paths.

            Gerrit: http://gerrit.dmdirc.com/4045

Change-Id: I2a8869f141074c7a3cce99075963a449155cc5ac