Update submodules: plugins (new commits)

plugins:
    a519bf9 Chris Smith <chris@dmdirc.com>
            Fix broken comparison

            Gerrit: http://gerrit.dmdirc.com/3946

Change-Id: Ifa7274b84cc17162cc6012a0d59884f73ee9fcfe

modules/plugins

@@ -1 +1 @@
-Subproject commit 4c68c5e600de64a0845ab5388db9f01603c36833
+Subproject commit a519bf92a323959ca9616880228795bb82c099ea