Revert "Update AdafruitIO.cpp"

This reverts commit 3531a8b.

Author: sellensr

src/AdafruitIO.cpp

@@ -42,7 +42,6 @@ void AdafruitIO::connect()
 
   if(_err_sub) {
     // setup error sub
-    Serial.print("setting up err_sub\n");
     _err_sub = new Adafruit_MQTT_Subscribe(_mqtt, _err_topic);
     _mqtt->subscribe(_err_sub);
     _err_sub->setCallback(errorCallback);