Update to QUnit 1.6.0

diff --git a/test/qunit b/test/qunit
index 74cc047c61507395b36db7065231572852f6d19d..3f5e8b2123c66d4c9ab83b76f3785e799cd9b5d5 160000 (submodule)
--- a/test/qunit
+++ b/test/qunit
@@ -1 +1 @@
-Subproject commit 74cc047c61507395b36db7065231572852f6d19d
+Subproject commit 3f5e8b2123c66d4c9ab83b76f3785e799cd9b5d5