Update submodules: util (new commits)

util:
    5b7f3a9 Chris Smith <chris@dmdirc.com>
            Allow ConfigFile to work on Paths.

            Apply a bunch of style fixes.

            Gerrit: http://gerrit.dmdirc.com/4000

Change-Id: I26514c6518d6c329fd2da7e51cbfbd5529d59b23

modules/util

@@ -1 +1 @@
-Subproject commit 18b3adddbc3c38c2a9e35514c54ba3f002069cbc
+Subproject commit 5b7f3a935834751eb5405419957145fcab8ee1cc