also we should call readFloatPressure() with readTempC() before calling readFloatAltitudeMeters() for correct result

Author: Emre Harbutoğlu

src/SparkFunBME280.cpp

@@ -477,6 +477,7 @@ float BME280::readFloatAltitudeMeters( void )
   // code on those planets. Interplanetary selfies are welcome, however.
 
 	// firstly read temperature for avoiding wrong calculation
+	readFloatPressure();
 	readTempC();
 
 	heightOutput = ((float)-44330.77)*(pow(((float)readFloatPressure()/(float)_referencePressure), 0.190263) - (float)1); //Corrected, see issue 30