1. add channel api

bin/dbVersion.json

@@ -14,7 +14,8 @@
     {"file": "20180721-1.sql", "version": 12},
     {"file": "20180807-1.sql", "version": 13},
     {"file": "20180811-1.sql", "version": 14},
-    {"file": "20180815-1.sql", "version": 15}
+    {"file": "20180815-1.sql", "version": 15},
+    {"file": "20180816-1.sql", "version": 16}
   ],
   "test": []
 }