added correction option

ESPtermostat.ino

@@ -109,7 +109,7 @@ void notFound(AsyncWebServerRequest *request) {
 
 void readSensor() {
     // read the actual temperature after it's been converted
-    temperature = sensor.getTempCByIndex(0);
+    temperature = sensor.getTempCByIndex(0) + CORRECTION;
     // do what you need with the temperature here
     metrics = "temp ";
     metrics += temperature;