Update README to include information on new /set?pcX=
Update README to include information on new /set?pcX=

dwright134/HeaterMeter,CapnBry/HeaterMeter,CapnBry/HeaterMeter,shmick/HeaterMeter,shmick/HeaterMeter,dwright134/HeaterMeter,dwright134/HeaterMeter,kdakers80/HeaterMeter,dwright134/HeaterMeter,shmick/HeaterMeter,kdakers80/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter,CapnBry/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter,dwright134/HeaterMeter,shmick/HeaterMeter,shmick/HeaterMeter,kdakers80/HeaterMeter,CapnBry/HeaterMeter,kdakers80/HeaterMeter,dwright134/HeaterMeter,CapnBry/HeaterMeter,kdakers80/HeaterMeter,kdakers80/HeaterMeter