Update example to be 1.8 compatible
Update example to be 1.8 compatible

rubenqba/pubsubclient,mknjc/pubsubclient,hemantsangwan/Arduino-PubSubClient,CanTireInnovations/pubsubclient,tomn46037/pubsubclient,Protoneer/pubsubclient,Imroy/pubsubclient,armtronix/pubsubclient,vshymanskyy/pubsubclient,knolleary/pubsubclient,arduino/pubsubclient,diegopx/pubsubclient,tomn46037/pubsubclient,CanTireInnovations/pubsubclient,tomn46037/pubsubclient,diegopx/pubsubclient,koltegirish/pubsubclient,doebi/pubsubclient,koltegirish/pubsubclient,tectiv3/pubsubclient,rubensmachado/pubsubclient,rubensmachado/pubsubclient,Protoneer/pubsubclient,liquiddandruff/pubsubclient,hemantsangwan/Arduino-PubSubClient,vshymanskyy/pubsubclient,tectiv3/pubsubclient,rubenqba/pubsubclient,Imroy/pubsubclient,armtronix/pubsubclient,doebi/pubsubclient,liquiddandruff/pubsubclient,rubenqba/pubsubclient,arduino/pubsubclient,arduino/pubsubclient,doebi/pubsubclient,rubensmachado/pubsubclient,koltegirish/pubsubclient,knolleary/pubsubclient,tectiv3/pubsubclient,plugplayco/plugplay-arduino-mqtt,diegopx/pubsubclient,Protoneer/pubsubclient,Imroy/pubsubclient,mknjc/pubsubclient,liquiddandruff/pubsubclient,mknjc/pubsubclient,vshymanskyy/pubsubclient,hemantsangwan/Arduino-PubSubClient,knolleary/pubsubclient,armtronix/pubsubclient,CanTireInnovations/pubsubclient