Fix compilation in DEBUG mode

src/TinyMqtt.cpp

@@ -139,7 +139,7 @@ void MqttBroker::onClient(void* broker_ptr, AsyncClient* client)
 	MqttBroker* broker = static_cast<MqttBroker*>(broker_ptr);
 
 	broker->addClient(new MqttClient(broker, client));
-	debug("New client #" << broker->clients->size());
+	debug("New client #" << broker->clients.size());
 }
 
 void MqttBroker::loop()

src/TinyMqtt.h

@@ -1,5 +1,4 @@
 #pragma once
-#include <ESP8266WiFi.h>
 #include <ESPAsyncTCP.h>
 #include <vector>
 #include <set>
@@ -7,6 +6,8 @@
 #include "StringIndexer.h"
 #include <MqttStreaming.h>
 
+// #define TINY_MQTT_DEBUG
+
 #ifdef TINY_MQTT_DEBUG
   #define debug(what) { Serial << __LINE__ << ' ' << what << endl; delay(100); }
 #else