added portnum for neighborinfo app

meshtastic/portnums.proto

@@ -142,6 +142,11 @@ enum PortNum {
    */
   TRACEROUTE_APP = 70;
 
+  /*
+   * Aggregates edge info for the network by sending out a list of each node's neighbors
+   */
+  NEIGHBORINFO_APP = 71;
+
   /*
    * Private applications should use portnums >= 256.
    * To simplify initial development and testing you can use "PRIVATE_APP"