Fix environmental correction ratio

Author: ostaquet

src/MQ131.cpp

@@ -178,8 +178,8 @@ MQ131Class::~MQ131Class() {
  	}
  	// For humidity > 75%, use the 85% curve
  	if(humidityPercent > 75) {
- 		// R^2 = 0.9986
- 		return -0.0141 * temperatureCelsuis + 1.5623;
+    // R^2 = 0.996
+   	return -0.0103 * temperatureCelsuis + 1.1507;
  	}
  	// For humidity > 50%, use the 60% curve
  	if(humidityPercent > 50) {
@@ -188,8 +188,8 @@ MQ131Class::~MQ131Class() {
  	}
 
  	// Humidity < 50%, use the 30% curve
- 	// R^2 = 0.996
- 	return -0.0103 * temperatureCelsuis + 1.1507;
+  // R^2 = 0.9986
+ 	return -0.0141 * temperatureCelsuis + 1.5623;
  }
 
  /**