Upgraded subgroups plugin.

diff --git a/mod/subgroups b/mod/subgroups
index cc425ada62263bd8cf83191b4170afd7bedd7302..142e0ceed906d16f0c8ad79bc39db8c40871c62e 160000 (submodule)
--- a/mod/subgroups
+++ b/mod/subgroups
@@ -1 +1 @@
-Subproject commit cc425ada62263bd8cf83191b4170afd7bedd7302
+Subproject commit 142e0ceed906d16f0c8ad79bc39db8c40871c62e