Improving serial logging of ESP8266 example. (#233)
Improving serial logging of ESP8266 example. (#233)

* Improving serial logging of ESP8266 example.

Hi, I made this change to be more easy to me understand what it's  happening with the connection.

* Update esp8266_mqtt.h
GoogleCloudPlatform/google-cloud-iot-arduino,GoogleCloudPlatform/google-cloud-iot-arduino,GoogleCloudPlatform/google-cloud-iot-arduino