Update submodules: plugins (new commits)

plugins:
    b3bc4cf Chris Smith <chris@dmdirc.com>
            Fix the URL Catcher plugin tests.

            Gerrit: http://gerrit.dmdirc.com/2684

Change-Id: Id7342bd5357f56b8f249ecfc79e7b7d7c2958caa

modules/plugins

@@ -1 +1 @@
-Subproject commit 1c2905d0f6fcd0b2ae410ce34ea5e10597000c70
+Subproject commit b3bc4cf09bdf343c73a5bf52e0c9d4e134999935