update themes module

diff --git a/lib/mezzanine-organization-themes b/lib/mezzanine-organization-themes
index 1833989b8edfdbe5d9cc8963f25b331ae9b442f5..b20416c163b5805d838b88261a113e3c227f0f0b 160000 (submodule)
--- a/lib/mezzanine-organization-themes
+++ b/lib/mezzanine-organization-themes
@@ -1 +1 @@
-Subproject commit 1833989b8edfdbe5d9cc8963f25b331ae9b442f5
+Subproject commit b20416c163b5805d838b88261a113e3c227f0f0b