Update plugins repo to 0.8.1 HEAD.

Change-Id: Ibd9aa5538c34158f97e6be7428020ec73a0e89c4
Reviewed-on: http://gerrit.dmdirc.com/3371
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

modules/plugins

@@ -1 +1 @@
-Subproject commit 8381857bdc7550b008cde24545f02c4c88f390ff
+Subproject commit 8f294c8ace14b178414543ebb9298b82ff471ca2