Unhide UML2 5.1.2 release for Mars.2.
diff --git a/downloads/hidden.txt b/downloads/hidden.txt
index e2a61ff..45dc32a 100644
--- a/downloads/hidden.txt
+++ b/downloads/hidden.txt
@@ -1,2 +1 @@
-modeling/mdt/5.1.2/R201602010816

 modeling/mdt/6.0.2/R201602100610