fix api status endpoint

lib/ClientManager.js

@@ -28,10 +28,6 @@ class ClientManager {
         };
     }
 
-    stats() {
-        return this.stats;
-    }
-
     // create a new tunnel with `id`
     // if the id is already used, a random id is assigned
     async newClient (id) {

server.js

@@ -31,7 +31,7 @@ module.exports = function(opt) {
             return;
         }
 
-        const stats = manager.stats();
+        const stats = manager.stats;
 
         ctx.body = {
             tunnels: stats.tunnels,