Update git submodules

* Update plugins/codemirror-editor from branch 'master'
  to 3cd520b1521ff7c558d0cd95274628a3a20de30a
  - Set rel and href as attributes
    
    Change-Id: Id261a8f4ce5408789e19129ba293acc7972e0f45
    

plugins/codemirror-editor

diff --git a/plugins/codemirror-editor b/plugins/codemirror-editor
index abe8a75..3cd520b 160000
--- a/plugins/codemirror-editor
+++ b/plugins/codemirror-editor
@@ -1 +1 @@
-Subproject commit abe8a75f7bedc75a73bd52d3acbc11bc754706f0
+Subproject commit 3cd520b1521ff7c558d0cd95274628a3a20de30a