sns: fix SoftwareSerial ctor for recent versions

code/espurna/sensors/MHZ19Sensor.h

@@ -76,7 +76,7 @@ class MHZ19Sensor : public BaseSensor {
 
             if (_serial) delete _serial;
 
-            _serial = new SoftwareSerial(_pin_rx, _pin_tx, false, 32);
+            _serial = new SoftwareSerial(_pin_rx, _pin_tx, false);
             _serial->enableIntTx(false);
             _serial->begin(9600);
             calibrateAuto(_calibrateAuto);

code/espurna/sensors/PMSX003Sensor.h

@@ -217,7 +217,7 @@ class PMSX003Sensor : public BaseSensor, PMSX003 {
 
             if (_soft) {
                 if (_serial) removeSerial();
-                _serial = new SoftwareSerial(_pin_rx, _pin_tx, false, 64);
+                _serial = new SoftwareSerial(_pin_rx, _pin_tx, false);
                 static_cast<SoftwareSerial*>(_serial)->enableIntTx(false);
             }
 

code/espurna/sensors/SenseAirSensor.h

@@ -162,7 +162,7 @@ class SenseAirSensor : public BaseSensor, SenseAir {
 
             if (_serial) delete _serial;
 
-            _serial = new SoftwareSerial(_pin_rx, _pin_tx, false, 64);
+            _serial = new SoftwareSerial(_pin_rx, _pin_tx, false);
             _serial->enableIntTx(false);
             _serial->begin(9600);
             _serial->enableRx(true);