Update submodules: plugins (new commits)

plugins:
    37d3c18 Chris Smith <chris@dmdirc.com>
            Remove UrlBuilder.buildUrl calls.

            Gerrit: http://gerrit.dmdirc.com/2836

Change-Id: I5f701673d9e4bec9a23f4d7c4078151d05ca7ea8

modules/plugins

@@ -1 +1 @@
-Subproject commit 6f7fce7b27340ef8c3a69d83ceeb585a8ac0a939
+Subproject commit 37d3c188587bcde8f146dd466d0837e8cfea1827