Update submodules: plugins (new commits)

plugins:
    607e82d Greg Holmes <greg@dmdirc.com>
            Switch to AutoClose instead of StreamUtils.

            Gerrit: http://gerrit.dmdirc.com/3793

Change-Id: I7db86ba79fc7837353ae12afef8fb1f01f4c07b2

modules/plugins

@@ -1 +1 @@
-Subproject commit 7ffc51227e2447454f7b6600b00d6b75f5972ae9
+Subproject commit 607e82d8d91ee7929f960ac4f77ad586bc108cf1