Merge pull request #300 from gonX/add-otd-version-0660

otd-versions: Add 0.6.6.0

Author: gonX

site/_data/otd-versions.json

@@ -20,5 +20,6 @@
   "0.6.3.0",
   "0.6.4.0",
   "0.6.5.0",
-  "0.6.5.1"
+  "0.6.5.1",
+  "0.6.6.0"
 ]