no pulseio for dht

dht.py

@@ -20,7 +20,7 @@ class dht_22(background_task):
         self.__data_callback__ = data_callback
         # Initial the dht device, with data pin connected to:
         if not DEBUG:
-            self.__dht_device__ = adafruit_dht.DHT22(gpio)
+            self.__dht_device__ = adafruit_dht.DHT22(gpio, use_pulseio=False)
         # Initialise background_task
         background_task.__init__(self)