Update README to new Sequence diagram markup style

README.md

@@ -381,10 +381,10 @@ You may imbed sequence diagrams into your wiki page (rendered by
 [WebSequenceDiagrams](http://www.websequencediagrams.com) by using the
 following syntax:
-    {{{ blue-modern
+    {{{{{{ blue-modern
       alice->bob: Test
       bob->alice: Test response
-    }}}
+    }}}}}}
 You can replace the string "blue-modern" with any supported style.