sensor/dht: increase the delay per DHT22 datasheet

Operating specifications / Communication and signal

"Data-bus's free status is high voltage level. When communication
between MCU and DHT22 begin, program of MCU will transform data-bus's
voltage level from high to low level and this process must beyond at least
**1ms** to ensure DHT22 could detect MCU's signal, then MCU will wait 20-40us for
DHT22's response."

code/espurna/sensors/DHTSensor.h

@@ -149,7 +149,7 @@ class DHTSensor : public BaseSensor {
             if ((_type == DHT_CHIP_DHT11) || (_type == DHT_CHIP_DHT12)) {
                 nice_delay(20);
             } else {
-                delayMicroseconds(500);
+                delayMicroseconds(1100);
             }
             digitalWrite(_gpio, HIGH);
             delayMicroseconds(40);