Fix #1314 - expose local port for listeners

docs/README.md

@@ -383,7 +383,7 @@ with some housekeeping information.
 struct mg_connection {
   struct mg_connection *next;  // Linkage in struct mg_mgr :: connections
   struct mg_mgr *mgr;          // Our container
-  struct mg_addr peer;         // Remote peer address
+  struct mg_addr peer;         // Remote address. For listeners, local address
   void *fd;                    // Connected socket, or LWIP data
   unsigned long id;            // Auto-incrementing unique connection ID
   struct mg_iobuf recv;        // Incoming data