updated README with new /data/interfaces schema

README.md

@@ -244,6 +244,7 @@ Any non-empty responses are JSON formatted messages.
             "type": "object",
             "properties": {
                 "name": {"type": "string"},
+                "router": {"type": "string"},
                 "description": {"type": "string"},
                 "ipv4": {
                     "type": "array",
@@ -254,7 +255,7 @@ Any non-empty responses are JSON formatted messages.
                     "items": {"type": "string"}
                 }
             },
-            "required": ["name", "description", "ipv4", "ipv6"],
+            "required": ["name", "description", "router", "ipv4", "ipv6"],
             "additionalProperties": False
         }
     }