Update submodules: plugins (new commits)

plugins:
    526cb3e Chris Smith <chris@dmdirc.com>
            Use config interfaces where possible.

            Depends-On: Iaabedda2fa68c4e5562bb069dcdf15fa0c3beeea
            Gerrit: http://gerrit.dmdirc.com/2767

Change-Id: Ibf9f673af600c9b02ce46c00826014c0d7fcce32

modules/plugins

@@ -1 +1 @@
-Subproject commit 2a45dc7ada5fe9c4bb4a9fdbcd473560aef35990
+Subproject commit 526cb3e37b98d573fb5a02ca46b2b55bb2f17c29